Which of the following statements is true?
a) all the populations in an ecosystem form the community.
b) a habitat represents all the biotic factors in an ecosystem.
c) the amount of nutrients in soil is an example of a biotic factor.
d) only one population can live in a habitat at a time.

Nerve cells are specialized to respond to stimulitrue or false?

Astudent wants to test the hypothesis that fertilizer improves the growth rate of grass seeds. to test this hypothesis, the student put the same amount of grass seed in 3 containers with the same type of soil. the student measured the growth at the end of the week. all plants received equal amounts of water and sunlight. if you were asked to graph this data, what would you place on the x-axis? a. fertilizer b. water c. plant growth d. week one

How does the carbon cycle involve an exchange of carbon