Label each invertebrate group as porifera, arthropod, echinoderm, mollusk, or annelid. more than one body segment, exoskeleton, jointed legs

soft-bodied, has a foot or tentacles, often has a shell

two body openings, simple body systems

endoskeleton, often has spiny skin

no body openings, no muscles or brain, lives in water

is this supposed to be a question

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.

well 1 they have there leader that controls them

answer; no longer than a reasonable period of time;