Exam 4: Animalia

What features identify the animal shown in the diagram below as an insect?

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

Although some exceptions exist, the majority of mollusks are protected within a shell that is secreted by the animal's ____________________.

The evolutionary tree of the vertebrates supports which conclusion?

Cephalization described a body plan that is characterized by

Which of the following investigations would be the least likely to provide useful information about the relationships within the kingdom Animalia?

Many of the organ systems observed in vertebrates are present in the annelids, the simplest coelomates; an exception is the _____, which helps explain why earthworms leave the soil on rainy days.

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

Sharks and the ray-finned fishes differ in several ways; the most significant difference is the composition of the skeleton.

Of the four animals shown below, which is believed to be most closely related to humans?

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

Chitin occurs in several kingdoms and numerous animal phyla but its greatest adaptive expression is seen in the

Sponge choanocytes collect food particles but there is no food distribution system within a sponge; how might surface cells receive nourishment?

Snakes can often be found resting on asphalt highways at dusk; what biological factor motivates them to engage in this behavior?

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

More than 95 percent of all living mammals are classified as ____________________; the remainder are classified either as marsupials or monotremes.

Relationships among the animals having body cavities can be easily determined by examination of embryonic development; vertebrates and echinoderms are grouped together because in each group the

Which arthropod is properly matched with the correct class?

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

The mesoglea in a cnidarian is not considered a true tissue because it originates as a ____________________ rather than from cell division.