Bio hw? help?

Question

5.Which of the following organisms do not have cells organized into tissues?

A. Hydras

B. Sea Urchins

c. sponges

d. sponges and hydras

6.The developemntal process that leads to the formation of tissue layers is

a. asexual reporduction

b.ecolution

c. gastrulation

d. fertilization

7.An animals body plan includes all of the following except

a. internal organization

b.shape

c.size

d.symmetry

8.the presence of a true body cavity(coelom)allows

a.direct exchange of oxygen and carbon dioxide with the environment

b.specialization of th egut

c. cephalization

d. bilateral symmetry

Answer 1

B

C

C

B

Answer 2

B-sponge cells are totipotent meaning they each can take on the function of any other.

C-gastrulation

C-size

B-specialization