A student thinks that populations higher in a food chain are larger because they deplete the populations of organisms lower in the food chain. Using evidence
from this lesson, explain why this student's thinking is incorrect.

What is the next step in muscle contraction after the actin changes shape? (apex)

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.

What do your cells need to live? a. carbon dioxide b. carbon c. air d. oxygen