Exam 19: Animalia

Relative brain size (brain weight/total body weight)tends to be larger in the monotremes than in either the marsupials or the eutherians.

Which group's adult body plan is properly matched with symmetry it displays?

During the algal blooms called red tides,consumption of bivalves is discouraged and harvesting may be prohibited; what aspect of bivalve life history is responsible for this association?

Radial symmetry occurs much less commonly than bilateral symmetry; the only radially symmetrical animal groups are the

One of the most poisonous marine organisms known is the cnidarian,commonly called the sea wasp or box jellyfish; the motile adult organism is best described as a(n)

The life cycle for an insect whose developmental strategy is complete metamorphosis is shown in the following illustration.What advantages are evident from the illustration?

Most animals reproduce sexually; fertilization begins a developmental sequence that progresses from

Only about 5 percent of extant mammals are classified either as marsupials or monotremes; the remaining 95 percent are classified as ________.

Fruit flies,blow flies,and black flies share a similar life history strategy; they first appear as larvae (commonly known as maggots),pupate,and eventually emerge as adult flies.This type of development is called

The evolutionary tree of the vertebrates supports which conclusion?

Except for the hagfish,lamprey,and their close relatives,all vertebrates have paired jaws; how did jaws evolve within an evolutionary clade that already had a skeleton?

Mammals are classified as endothermic homeotherms; if exposed to hot or cold temperatures,their body temperature will remain relatively stable.

How do biologists interpret the pattern of species richness shown in the following illustration?

Keratin is an important and widespread structural protein in animals,forming structures as diverse as feathers,toenails,and the carapace of crabs.

Most animals have evolved a body cavity; in the coelomates,the cavity is characterized by a

Which mollusk is properly matched with the correct class?

During cephalization,the structures that develop at the anterior margin of a bilateral animal are primarily associated with ________ and ________.

Of the labeled features in the following diagram,only the dorsally positioned nerve cord would be present in an echinoderm.

The periodic cicadas start life as a fertilized egg,hatch to become a nymph that burrows underground for 13 or 17 years,emerge as a nymph,and molt to become an adult.Which term best describes this life cycle?

Sponges are considered the most ancient of animals; although multicellular,sponges have not developed the ________ present in all other animals.