what kind of invertebrates is hydra?
A. Insects
B. arachnids
C. arthropods
D.echinoderms
E.crustaceans
what kind of invertebrates is Earthworm?
A. Insects
B. arachnids
C. arthropods
D.echinoderms
E.crustaceans
what kind of invertebrates is Snail?
A. Insects
B. arachnids
C. arthropods
D.echinoderms
E.crustaceans