7. muscle cells, which need a lot of atp, would be expected to have a lot of the organelles involved in cellular respiration.

Which of the following is not a main characteristic that scientists focus on when determining which kingdom an organism belongs to

Which of the following structures is not found in both plant and animal cells? a) chloroplast b) cytoskeleton c) ribosomes d) mitochondria

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.