Animals are mainly classified by their tissues, symmetry, body cavities, and group of answer choices a) fate of the blastopore b) type of cleavage c) number of germ d) layers presence of chloroplasts

a) Fate of the blastopore

Explanation:

The fate of the blastopore has been used as a character for the classification of animals and the building of taxonomic trees. It is .because this character separatesprotostomes from deuterostomes. In Protostomes the blastopore becomes  the mouth and in Deuterostomes  the mouth did not come from the blastopore;  the blastopore becomes the anus.

Examples of protostomes are the Nematodes, mollusks, annelids etc.

Examples of protostomes are echinoderms and chordates.

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.