Invertebrates️️Animals without a backbone. About 95% of known animal species.

Calcarea and Silicea️️phylum that includes sponges; no symmetry, tissues, body cavity,

organs, nervous system; basal animals; mostly marine; contain spicules; most are

hermaphrodites; free-swimming during larval stage and sessile (non motile) as adults;

suspension/filter feeders

Suspention feeders️️small and large organisms that use filtering and trapping techniques to

collect minute food particles su...