By examining the age of the sediment layers where the stone tools are found, researchers can make an educated guess as to their age. Another method for determining the date the tools were manufactured is radiometric dating.
What is meant by radiometric dating and why is it significant?In radioactive dating, radioactive isotopes are used to establish the age of rocks and minerals. This method is useful for dating volcanic and metamorphic rocks since sedimentary materials cannot be dated using the stratigraphic correlation approach. There are more than 300 isotopes that exist naturally.
To determine when the ax was created, scientists can employ radiometric dating. By measuring the relative ages of certain radioactive elements contained in the sample, radiometric dating is a technique for dating geological and archaeological artifacts.
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what is the primary distinction of being an animal?
A) ability to reproduce
B) having a backbone
C) ability to digest
D) ability to turn sunlight into energy
Answer: A) ability to reproduce
Explanation:
Which source of renewable energy is the most location-dependent in its production?
hydroelectric
geothermal
wind
solar
Pick one of the following genetic variations that have occurred in human evolution. Then pick one of the three causes of genetic variation (meiosis, replication errors, environmental impacts) and make a claim as to why you think that particular cause of genetic variation was the cause of the change. Use supporting research and/or data to support your claim.
- Smaller bodies
- Smaller brains
- Smaller teeth and jaws
Smaller teeth and jaws are due to genetic variation, which occurred by mutations (errors in DNA replication) and were selected to fill a suitable niche.
What is evolution?Evolution is the mechanism of change of one species to adapt given environment, whereas mutations are the raw material for evolution.
In this regard, scientific evidence supports the fact that jaws evolved to become shorter in humans and thus adapt to a pastoral lifestyle.
In conclusion, smaller teeth and jaws emerged by mutations and were selected to fill a suitable niche.
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what do we call the outer layer of the nucleas?
One would expect well-drained soils to have the highest organic matter contents where the climate is?
One would expect well-drained soils to have the highest organic matter contents where the climate is cool and humid.
What is organic matter?Reducing or eliminating tillage, which triggers a microbial action burst that hastens the decomposition of organic matter and raises erosion. Reduce erosion by taking the necessary action. SOM is mainly found in topsoil.The topsoil is the soil's topmost layer. The majority of the biological soil activity on Earth takes place there because it has the highest concentration of organic materials and bacteria.The topsoil is where most of the biological activity in the soil takes place and has the highest concentration of organic matter and nutrients. Without residue or living cover, soil is vulnerable to erosion.Histosols are soils that are rich in organic materials and unbroken plant matter.
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How can you use more renewable sources of energy? Select all that apply.
Use carpools or public transportation.
Stop using all forms of energy altogether.
Grow your own food and buy local products.
Wait for governments to make laws.
Answer: a and c
Explanation: You don't need to wait on the government to make laws to be able to be energy efficient, nor do you have to stop using all forms of energy altogether.
4. Which of the following are parts of the amniotic reptile egg? (Choose all that apply) amniotic fluid albumen water space shell membrane
The parts of the amniotic reptile egg include the amniotic fluid, the albumen, and the shell.
Parts of an amniotic reptile's eggThe various parts of amniotic reptile's eggs include:
The external shell which serves as a protective layerThe yolk which supplies energy to the embryoThe albumen supplies the embryo with water and proteinsThe extra-embryonic membranes - the chorion, the allantois, and the amnion.The chorion serves as a channel for gaseous exchange between the embryo and the environment.
The allantois partially functions as waste manager and in respiration. It stores nitrogenous wastes and gets rid of them as well as participates in gaseous exchange along with the chorion.
The amnion protects the embryo against mechanical shocks. It also protects the developing embryo from being dehydrated.
In other words, the 3 extra-embryonic membranes protect, facilitate gaseous exchange, and ensure that wastes are properly disposed of.
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Answer: Everything Except Water space
Explanation:
Which of the following are an advantage and disadvantage of hydrogen energy use?
Advantage: Hydrogen is easy to store.
Disadvantage: Hydrogen is scarce.
Advantage: Hydrogen allows for zero emissions.
Disadvantage: Hydrogen is difficult to store.
Advantage: Hydrogen is an efficient form of energy.
Disadvantage: Hydrogen allows for pollution to be emitted.
Advantage: Hydrogen fuel has established infrastructure.
Disadvantage: Hydrogen is scarce.
The following are an advantage and disadvantage of hydrogen energy use and is denoted as option B.
Advantage: Hydrogen allows for zero emissions.Disadvantage: Hydrogen is difficult to store.What is Hydrogen?This is an element with a atomic number of 1 and exists as a colorless flammable gas.
It has to be liquefied which is why it is difficult to store and allows for zero emissions which makes it a clean source of energy.
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The Smokey the Bear campaign attempted to suppress and eliminate wildfires from forested areas altogether. Explain how fire suppression can negatively impact the health of a forest ecosystem?
A. Suppression allows weaker, more vulnerable trees that would have been weeded out by fire to survive.
B. Suppression leads to less diversity of tree species, so beetles spread more quickly between trees.
C. Suppression leads to equal/even-age stands of mature trees, which the beetles prefer.
1. Naturally occurring wildfires are most frequently caused by lightning
2. NATURAL forest fires can temporarily increase fertility of a region
3. burning process releases nutrients which then fertilize the soil.
3a. fire chemically converts nutrients bound in dead plant tissues and the soil surface to more available forms
3b. fire indirectly increases mineralization rates through its impacts on soil microorganisms (Schoch and Binkley 1986).
4. slash and burn process successfully clears land for agriculture and introduces fertilizing nutrients into the soil, leaving it in excellent condition to grow crops.
AP ENVIRONMENTAL SCIENCE
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What happens when a coral pushes out the algae that live there?
coral cooling
coral bleaching
algae bloom
coral warming
ASAP PLS There are lots of big words in genetics! One way to start thinking about the process of meiosis is to ask yourself some questions.
If two parents are contributing genetic material to their offspring, why don’t the genes and chromosomes double in each generation?
If each parent has two sets of genes and chromosomes, why do their offspring receive only one set from each parent?
Answer:
1) the genes and chromosomes do not double after each generations because parental sex cells are haploid and only contain one set of chromosomes. During fertilization the two cells fuse to form a diploid zygote with two copies of genes and chromosomes. For example a normal human has 46 chromosomes (2 copies of 23 chromosomes) during reproduction gametes which contain 23 chromosomes (haploid) fuse to form an offspring with the correct number of chromosomes ( 23 + 23 = 46).
2) offspring only receive one set of chromosomes from each parent so to maintain the chromosome number of humans. If this did not happen you would not be the same species.
Based on the punnet square above, what is the probability that an offspring from this cross will have a homozygous recessive genotype ?
A. 100%
B. 50%
C. 25%
D. 0%
Answer:
C)25%
Explanation:
the results of the punnet square are:
1. TT (homozygous dom)
2. Tt (heterozygous)
3. Tt (heterozygous)
4. tt (homozygous recessive)
capital letters are dominant and lowercase are recessive
Answer:
25%Explanation:
Homozygous Recessive: (homo means same) Both letters representing the genes are the same, and they are recessive (lowercase t)
Each box within a punnett square represents a 25% chance possible outcome.
There is only one box in this punnett square wherein both letters are lowercase t.
Name the labeled structure
At present, only a very small proportion of genetically modified foods must be labelled. Some consumer advocates are urging the federal government to label all foods that contain genetically modified material, so that consumers may choose whether to purchase them or not. What are you views?
Genetically modified material is safe it was proven a ton of times no need to worry sometimes its even healthier than normal food.
which of the following is a cause of a DNA mutation?
What is the only cephalopod with an external shell?
A. nautilus
B. cuttlefish
C. squid
D. octopus
Answer:
the only cephalopod with an external shell is A. nautilus
Answer:
a. nautilus
Explanation:
Nautiluses are the only cephalopod with an external shell.
Look on the box that says ‘show genotype’. What is the genotype of the offspring
look at the picture
Answer:
Gamma rays have a higher frequency than radio waves
Most skin, hair, and nail fungal infections (including ringworm) are caused by ______.
Select one:
a.
dermatophytes
b.
viruses
c.
prokaryotes
d.
bacteria
Answer: it's a.
(don't forget to click thanks!!)
look at the picture
Answer:
Clean + Renewable
Explanation:
Answer:
Clean and Renewable
Explanation:
hope it helps
The hydrogen ion reservoir is located in the ____________________ and ATP synthesis occurs in the ____________________. In order to facilitate reproduction, independent of cell division, both of these organelles have _________________________ and _________________________.
Front legs of a cat and the arms of a human share a bone structure that suggests a common evolutionary lineage. Therefore these skeletal structures are
Answer:
homologous
Explanation:
Homologous organs are organs that share some similarities in different organisms but whose function differ in these organisms.
:)
Forelimbs of cat and arms of human share a similar bone structure, suggesting a common lineage. These type of common structure are said to be homologous structures.
Organs that function differently in different organisms but have some similarities are known as homologous organs. Although the organs are structurally similar, they serve different purposes. One of the arguments used by scientists to support evolution is the existence of homologous organs.
Even though their structures are based on the same five-digit plan, human arms and the front legs of cats serve different purposes.
Therefore, forelimbs of cat and forelimbs of humans are said to be homologous structures.
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Which organelle in the table is correctly matched with its function?
The organelle in the table that correctly matches its function is the ribosome because it produces proteins.
What is a ribosome?A ribosome is an organelle that functions as a protein factory in the cell, whereas vacuoles contain dissolved materials and store water.
Mitochondria are energy producers by the process of cellular respiration, and lysosomes contain hydrolytic enzymes.
In conclusion, the organelle is a ribosome that produces proteins.
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Why are microorganisms used to produce enzymes?
If possible, focus on the production of pharmaceutical enzymes via microorganisms, but a general explanation is sufficient as well.
Microorganisms produce enzymes in order to break the macromolecules such as proteins and starches.
Why are microorganisms used to produce enzymes?
Microbial enzyme production occur to degrade natural polymers such as proteins, starches, or pectin. The microorganisms secrete the enzymes in order to extract nutrients from it.
So we can conclude that Microorganisms produce enzymes in order to break the macromolecules such as proteins and starches.
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In which situation is work being done?
A. A woman lies on the ground.
OB. A boy stands on a chair.
C. A man pushes against a wall.
OD. A girl throws a ball.
What happens to the trees in the taiga as global temperatures rise?
They grow bigger and use more resources.
They lose their needles in the winter.
They grow farther up the mountains.
They grow farther down the mountains.
Answer:
C
Explanation:
because they grow more than others time
Which fossil fuel needs to migrate into
pockets in order for humans to extract it
from the ground?
A. gold
B. aluminum
C. petroleum
D. uranium
Answer:
LA RESPUESTA ES LA C) PETROLEUM
Explanation:
LA C) ES PORQUE SEGUN YO ES DE ACUERDO EL TEXTO AUE HAS MANDADO EN TU TAREA
HELP THIS IS REALLY SERIOUS I NEED HELP AHHH I DONT WANT TO FAIL!! question:Those who support the alien theory believe that the ancient Egyptians were very primitive. What evidence about the ancient Egyptians suggests that this claim is inaccurate? Check all that apply. They built the Seven Wonders of the Ancient World. They invented an early version of the wheel. They had a well-developed agricultural system. They raised domesticated animals. They developed a writing system. They used early forms of tools.
The evidence about the ancient Egyptians that suggests that this claim is inaccurate are:
They had a well-developed agricultural system.They raised domesticated animals.They developed a writing system.They used early forms of tools.What is a Supporting Detail?This refers to the use of evidence in order to validate a claim that is made through the use of factual or statistical data.
Hence, we can see that based on the fact that people thought that the pyramids of Egypt were built by aliens was false because there are supporting details to prove them otherwise and they are listed above.
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Explain the scientific interpretation of the fossils found in the cradle of humankind.
The scientific interpretation of the fossils found in the cradle of humankind,
The Cradle of Humankind region comprises 15 major fossil sites, some of which date back 5-million years.
The name Cradle of Humankind reflects the fact that the site has produced a substantially large number of hominin fossils, some the oldest ever found, dating as far back as 3.5 million years ago.
How was the Cradle of Humankind formed?The Cradle of Humankind Site comprises a strip of a dozen dolomitic limestone caves including the fossilized remains of ancient forms of animals, plants and most notably, hominids. The dolomite in which the caves formed, started out as coral reefs flourishing in a worm shallow sea about 2.3 billion years ago.
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Which of the following describes the impact on human health from global climate change?
A) Excess greenhouse gases will cause competition among vectors for hosts, and the vectors will die off.
B) Global climate change will result in the warming of cooler regions and will increase the spreading of disease.
C) Melting glaciers will keep regions too cold and prevent vectors from migrating to these regions.
D) Warmer climates will prevent vectors from traveling to new regions and infecting more humans.
Answer: B
Explanation: B) Global climate change will result in the warming of cooler regions and will increase the spreading of disease.
Answer:
B) Global climate change will result in the warming of cooler regions and will increase the spreading of disease.
Explanation:
It will be right on the quiz. Have a great, meaningful, and productive day, fellows!