When grown in a greenhouse, the leaves of Aloe nobilis are green. When found in the desert in the wild, however, the leaves are often red. What best explains this observation? A. The environment affects the expression of A. nobilis genes

B. The sun changes the color of chlorophyll pigments

C. The plant uses red pigments for photosynthesis

D. The leaves become infected with a red parasite

Plzz hurry im being timed during times of vigorous physical activity, muscles require a constant supply of oxygen. how does the body respond to these needs? a. breathing rate and heart rate both decrease. b. breathing rate and heart rate both increase. c. heart rate decreases, but breathing rate remains stable. d. breathing rate increases, but heart rate remains stable.

The blue particles in this image are able to cross the cell membrane through simple diffusion. how will they be transported? outside the cell inside the cell o a. the substances will move directly across the membrane from outside the cell to inside the cell. b. the substances will move through channels in the membrane proteins from outside the cell to inside the cell. o c. the substances will move through channels in the membrane proteins from inside the cell to outside the cell. o d. the substances will move directly across the membrane from inside the cell to outside the cell.

Draw a simple labelled diagram if a collenchyma tissue