Which structure of the heart acts like an automatic door that closes once blood enters a chamber and forces it to exit in the proper direction.

a.
atria

b.
valves

c.
arteries

d.
ventricles

hello there the answer is d

videntify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.

the food storage products of chrysophytes are oils or the polysaccharide laminarin.   formerly classified as plants, the chrysophytes contain the photosynthetic pigments chlorophyll a and c all but the yellow-green algae also contain the carotenoid pigment fucoxanthin.

what in the weirdo : o