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This term describes an appendage with two branches; one branch being the gill, the other branch being the leg:

The respiratory organs of found in terrestrial forms of arthropods are:

The Molluscan class “Gastropoda” includes which of the following organisms?

Grasshoppers breathe by these, tubes that carry air throughout their body.

The first pair of appendages on a spider is modified fangs called:

Fused body regions of the arthropods are referred to as:

For a given substance, the amount of light absorbed depends upon which of the following?

Structures responsible for movement in an Echinoderm:

Squid and octopuses have __________ to allow them to escape predators.

These bivalve molluscs are able to “swim” by quickly closing their shells: