Which of the following is the defining characteristic of the clade Ecdysozoa for which this group is named?

Many young animals are __________, a sexually immature form that is morphologically distinct from the adult stage. These young animals undergo __________ to become __________, which resemble adults but are not yet sexually mature.

Which of the following groups does not exhibit bilateral symmetry?

Which of the following is a characteristic of cnidarians?

In the embryo of a shark, ectoderm gives rise to __________; mesoderm gives rise to __________; endoderm gives rise to __________.

Unlike other animals, sponges __________.

Which of the following is characteristic of protostomes?

All animals with bilateral symmetry have __________ germ layer(s).

A true coelom is __________.