19. the pia mater layer in the ventricles is rich in blood vessels that produce
a. keratin.
b. csf. c. new skin.
d. dopamine.

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.

it marks things for degradation via the proteasome. it alters there celluar location.

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.

the sun creates it's own light, also gives light and life to bunch of stuff like plants,animals,humans etc.photosyntesis is the process of making food which needs sun,water,nutrients etc.