The amniotic egg is a characteristic of
a. amphibians.
b. reptiles.
c. birds.
d. both
b. and
c.

Why is it important that fibrin is insoluble in water?

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

Agenus is a taxonomic grouping that identifies a collection of species. when a scientist discovers a new species, how is this species assigned to a genus