Porifera, Cnidaria, Ctenophora

Containing two tissue layers: _________.

Responsible for secreting spongin (collagen) and spicules in a sponge: _________

Outer tissue layer in cnidarians and ctenophores: _________.

Without symmetry: _________.

Coral reef separated from coast by a lagoon: _________.

Cell with a nucleus: _________.

Being divisible by one plane (into two equal halves): _________.

Circular coral reef remaining after seamount has subsided: _________

Class of cnidaria with polyp as dominant body form; examples = anemones, corals: _________

Class of cnidaria with medusa as dominant body form; example = box jellyfish: _________.