What feature do Tardigrades and arthropods share?

Ecologically, sea stars are at what trophic level?

Crustacea are biramous, meaning they possess

The segments of crustaceans are covered with a dorsal plate or _____________ and a ventral plate or ______________.

When a parasitic insect is itself parasitized by another insect,

A sea star feeds by absorbing food through the

Copulatory spicules function to

Arthropods are successful because they have

Androgenic glands in the amphipod function to

The difference(s) between the traditional and cladistic classification of chordates and their extant sister groups is a difference in