Science Homework Help

I’m working on a biology multi-part question and need an explanation and answer to help me learn.

What are the five major classes in the phylum Echinodermata? What is unique about each of these classes? (5 pts)

There were 2 unusual defensive strategies used by echinoderms? Please include an example of the organism with the strategy. (5 pts)

1. What are the 4 characteristics that all chordates have in common? What are the 3 major phyla that have some of these characteristics during their life cycles. (5 pts)
2. Define micronekton. Please provide an example. How are micronekton different from plankton. (5 pts)