Some of the first animals to develop an endoskeleton were
mollusks,
arthropods,
annelids,
echinoderms

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen

What would most likely happen if a person increased the amount of saturated fat in his or her diet? the person's risk of cardiovascular disease would increase. the person's risk of cardiovascular disease would decrease. the person's bad cholesterol would decrease. the person’s good cholesterol would increase.