The esophagus is a tube in which food is pushed from the mouth to the stomach. As the food is pushed through the esophagus, it becomes more compact. This is — A.
a chemical change, only.

B.
a physical change, only.

C.
both a chemical and a physical change.

D.
neither a chemical nor physical change.

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.

hi there!

answer: b. nucleolus

explanation: nucleolus is a structure in the nucleus are ribosomes are made.

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: d

-charlie

you! : )

: d

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times

can you make it bigger i can't see it