Bilaterally symmetrical animals have________embryonic tissue layers, known as________ ,___________, and________ . Radially symmetricalanimals have_____________ tissue layers; they lack the___________layer.

Grasshoppers belong to the Domain _____ the Kingdom _____ and the Phylum____

Many cephalopods have a structure found inside of their head called the "pen". Because cephalopods have a "pen", evolutionary biologists have concluded; Cephalopods are evolving an endoskeleton The pen is the result of a random mutation in cephalopods The ancestor to the these cephalopods had a shell That cephalopods are evolving a shell

The clade Therapsida technically includes modern mammals true false

Which of the following animal groups, originating before the Paleozoic Era, is monoblastic, with one embryonic germ layer, but no organized digestive system, nervous system, or circulatory system? the acoelomate flatworms (like the planaria) the agnathan fishes (like the sea lamprey) the cephalochordates (like the lancelet) the urochordates (like the sea squirt) the poriferans (like the sponges)

Which of the following terms apply to the body cavity of Molluscs (except Cephalopods)? Choose all that apply. O hemocoel with a coelom persistent blastocoel O pseudocoelom/hemocoel acoelom