Which structure (or structures) acts (or act) as a protective surface agains the outside environment, AND a place for muscle attachment? (mark all that apply) nematode spicules molluscan coelom nematode cuticle the platyhelminthine pneumocoel arthropod exoskeleton platyhelminthine exoskeleton molluscan valve

The chromatophore pigment is present in which animal group? Annelida Nematoda Cephalopods Platyhelminthes

do any nematodes have similar adaptations due to their needs being met by their hosts? I know that nematodes are parasitic and not mutually beneficial, but they are still symbionts and perhaps have evolved to no longer require some components of basic anatomy in result of their needs being met by their host. please cite sources

Zoology arthropoda. Name the structure and it’s function.

Label the parts with word bank.

Which of the following terms apply to the body cavity of Molluscs (except Cephalopods)? Choose all that apply. O hemocoel with a coelom persistent blastocoel O pseudocoelom/hemocoel acoelom

You are trying to identify a living organism which you are observing closely.  Which one of the following would convince you that the organism is acoelomate?     It responds to food by moving toward it.     It is triploblastic.     It has bilateral symmetry.     It possesses sensory structures at its anterior end.     Muscular activity of its digestive system distorts the body wall.   The flatworms have     a true coelom     a pseudocoelom     radial symmetry     tissues derived from the three basic germ layers (i.e. they are triploblastic) need help with both questions for my HW please thank you!