Which occurs when the body responds to the environment by maintaining a stable internal environment despite changing
external conditions?
O spontaneous generation
O homeostasis
growth and development
O reproduction
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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.

trachea, alveoli, lung capillaries, arteries

1. is geographic distribution

2 is increasing complexity

3 is transitional forms