Xavier listed the steps involved when sponges take in food
and oxygen.
1. Water is drawn in through pores and enters the central
cavity
2. Food is filtered and digested.
3. Water leaves through an opening at the top of the body.

i think that c)gold was found there

but i am not sure

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands