Exam 32: Deuterostome Animals

If a researcher took a sample from a freshwater river and discovered a small (5 cm), elongated, filter-feeding organism with pharyngeal slits, it would most likely be a _______.

Mammalian diversity is greatest in the _______ and lowest in the _______.

Evolution of jaws first occurred in fishes within the group called

Amphibians have survived and prospered for millions of years, but today many species are disappearing, and populations of others are declining seriously.What features of their life histories might make amphibians especially vulnerable to the kinds of environmental changes now happening on Earth?

Genetic evidence suggests that limited interbreeding occurred among Homo neanderthalensis, Denisovans, and early modern Homo sapiens when they occupied the same range.Based on archeological and genetic evidence, it is likely that _______ moved from _______ to _______ and came in contact with _______.

The swim bladders of bony fishes

Early in its evolutionary history, the primate lineage split into two clades, the _______ and the _______.

Refer to the figure. The embryo of an amniote egg is held within a fluid-filled sac called the amnion.How does the amnion retain advantages of a fish or amphibian egg floating in a pond?

Characteristics that distinguish primates from other mammals include

Refer to the figure. Which statement about the three organisms shown in the figure is false?

Which of the following is a major difference between the chondrichthyans and the ray-finned fishes?

Refer to the figure. Of the two major groups of birds, the _______ contain the bird shown at left, and the _______ contain the bird at right.

_______ are bilaterally symmetrical animals that possess a dorsal hollow nerve cord, a tail that extends beyond the anus, and a notochord at some stage of their life cycle.

_______ use their tube feet to capture large prey, such as polychaetes, gastropods, and bivalve mollusks?

Which of the following is not a trait shared by modern birds and the theropods from which they are thought to have evolved?

One of the features that distinguishes mammals from most reptiles is the mammal's _______ heart.

Which feature of echinoderms allows them to feed on the soft body parts of bivalves?

A few species of frogs and salamanders are _______, which means they give birth to well-developed young.

Which of the following deuterostomes possesses a notochord?

Lampreys have rasping "teeth" made of keratin.Because lampreys do not have _______, these "teeth" are not used for seizing or biting prey.