A) Sponges exhibit radial symmetry. B) Sponges are autotrophs. C) Sponges lack a true body cavity. D) Sponges lack true tissues. read more
Sponges are similar to other animals in that they are multicellular, lack cell walls, and produce sperm cells. Unlike other animals, they lack true tissues and organs, and have no body symmetry. The shapes of their bodies are adapted for efficient water flow through their central cavity. read more