Which of the following is a renewable resource? a. petroleum b. coal c. soybeans d. natural gas

What are the four basic classes of organic molecules how do they differ structurally and functionally

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 is the farthest destination to date for a human spaceflight mission?