Please help me I don't know these.

The space that an organism in an ecosystem lives in is called aA) communityB) populationC) habitatD) nichello If a train is moving south at 50 m/s and a person is running SOUTH on the train at 5 m/s, what is the velocity of the person as seen by someone not moving (watching the train going by)A-45 m/s NorthB-50 m/s SouthC-55 m/s NorthD-100 m/s South 20% of 50. Mathmethics One healthy way to deal with stress isA. Lots of time aloneB . Lots of blameC. Lots of sleepD. Lots of exercise 5. Which of the following do NOT affect the destructiveness of an earthquake?A. depthB. magnitudeC. locationD. human activity The second term of an arithmetic sequence is 5, and the third term is 20. What is the first term? _____ cells are long to carry impulses quickly from one place to another What does the nucleus do. The president signs legally binding nuclear arms terms with Iran without seeking congressional approval is an example of an _______________________. La probabilidad de que julio salga con carla es 0.75 , y la probabilidad de que salga con marisol es de 0.50. Si la probabilidad de que salga con carla o marisol es 0.85; calcular la probabilidad de que salga con ambas a la vez 2) Which of the following is not an attribute of computers? a) emotion b) accuracyc) high speed d) arithmetic unit 3. If 480 movie tickets were sold on Saturday,how many were child tickets?Child= 15%Adult= 75%Senior=10% Please help me any Spanish learners Say who you liked and dislike in the happy prince story and why ? What are the 6 kingdoms of life? Provide an example for each. goals that are not immediately obvious but influence how an author presents the facts are known as what? List the three-part government of the British colonies and tell what each part did. Answer in your own words. A canoe travels 8 miles per hour downstream and 2 miles per hour upstream.Let x represent the canoe's speed with no water current (still water) and yrepresent the speed of the water current, in miles per hour. Then the situationcan be represented by this system of equations:X+ y = 8x - y = 2Choose the two correct options.A. The speed of the canoe in still water is 3 miles per hour.B. The speed of the water current is 5 miles per hour.C. The speed of the water current is 3 miles per hour.D. The speed of the canoe in still water is 5 miles per hour. people who have migrated to a different land from where they were born Find all zeros f(x) = 3x^2+8x+7