The stinging cell of Cnidarians (jellies and anemones)

What is the name of this body part?

Sorting through the water for plankton or organic matter

External armor made of chitin

Organisms that consume dead organisms (these animals are eating a dead whale carcass)

The extensions of this sea star are called ___

The space along the coast between high tide and low tide.

A way to group animals by a common characteristic. (Example: as all organisms with stinging cells on tentacles are in the group Cnidaria)