Why is the human heart not considered to be a living organism a. it cannot complete photosynthesis. b. it cannot reproduce itself. c. it is not made of cells. d. it does not reguire oxygen.

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is .

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.

Which set of terms best describes a community of miners who live out in the countryside of west virginia and use specialized geological equipment to analyze the composition of rock?