As the skin ages, it loses its ability to restore its shape due to a: decrease in collagen.

decrease in hormones.

decrease in keratin.

decrease in elastin.

What is the statement plant growth is affected by the color light

The ultimate purpose of respiration: a. inhale 02 and exhale co2 b. place oxygen in the lungs c. place oxygen in the blood d. deliver oxygen to every blood cell

The sea slug that considered to be a photosyntheesizing animal