Exam 20: Mammals

Since the discovery of Lucy,new finds of even older hominid fossils have extended our knowledge of human ancestry.For example,in 2001,the sands of Chad yielded skeletal remains of the most ancient hominid yet discovered,_____________________.

A characteristic of mammals is

Homo sapiens owes much of its cultural and intellectual achievements to our ancient tree-living or _____________ ancestry.

The barren-ground caribou undergo annual migrations from winter ranges on the tundra to summer ranges in the boreal forest.

The only therapsid group which survived to enter the Mesozoic was the

Mammals appeared in the Mesozoic,but did not begin their extensive radiation until the Cenozoic.

Carnivorous animals have a longer digestive tract,and a small cecum.

The calls of echolocation bats are "frequency modulated," meaning that

The fur of mammals

The therapsids were the first mammals.

During the annual growth,antlers develop beneath a cover of highly vascular skin called ________________.

Some northern-dwelling mammals molt to blend in with the changing color of the environment.

An example of a monotreme is the

Pouched,viviparous mammals are called ______________.

Of the two kinds of mammals' sweat glands,the one that produces a watery sweat is called ________.

The structures that are not derivatives of the mammalian integument are

Hair is produced by the layer of skin called _______________.

The four kinds of teeth that are generally recognized in mammals are molars,premolars,canines,and ___________.

True horns are

_____________ are hunted and killed for their horn,which is believed erroneously to be an aphrodisiac.