Complete metamorphosis __________.

In arthropods, molting is necessary because __________.

Sowbugs are really crustaceans, not insects. Therefore, a sowbug does not have __________.

The majority of animal species are __________.

An unidentified species of animal displays the following characteristics: bilateral symmetry, a complete digestive system, an open circulatory system, distinct body segmentation, and a series of molting stages during growth. To which of the following animal phyla does this species most likely belong?

Which of the following animals is most closely related to spiders?

Which phylum is characterized by animals that have a segmented body?a. Cnidariab. Platyhelminthesc. Arthropodad. Mollusca

What is the function of the arthropod exoskeleton?a. The presence of an exoskeleton has given arthropods a good fossil record, because hard parts fossilize more readily than do soft tissues.b. It has no well-established function. (Trilobites had an exoskeleton, and they went extinct.)c. It provides protection and functions in locomotion.d. It makes growth by molting possible.

Why is the pea wrinkle-seed allele a recessive allele?a. It 'recedes' in the F2 generation when homozygous parents are crossed.b. The trait associated with the allele is not exhibited in heterozygotes.c. Individuals with the allele have lower fitness than that of individuals with the dominant allele.d. The allele is less common than the dominant allele. (The wrinkled allele is a rare mutant.)