Give two examples of a deuterostome and two examples of a protostome.

Protostomes: mollusks such as bivalves or gastropods.

                      arthropods such as crustaceans or insects.

Deuterostomes: echinoderms such as the starfish

                           hemichordates such as Enteropneusta (marine    

                           vermiculated animals)

Explanation:

The embryonary development of bilateral coelom animals makes a place for the division of two groups: protostomes and deuterostomes. Among protostomes might be mentioned the flatworms, annelids, mollusks, and arthropods. Deuterostomes include echinoderms and chordates, among others.              

These two groups differ in their specific development. Protostomes show spiral initial segmentation, and the mouth develops as a first opening near the blastopore. Deuterostomes show radial segmentation, the anus develops near the blastopore and the mouth develops later in another place.

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.

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explanation: