A feature that is present in most female mammals, but not male mammals, is
1. generating body heat internally. 2. subcutaneous fat. 3. the ability to nourish young with milk. 4. breathing air.
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The three main groups of mammals are the
1. 2. 3. 4. monotremes, marsupials, and placental mammals. platypuses, echidnas, and marsupials. rodents, carnivores, and primates. kangaroos, koalas, and wombats.
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The first true mammals appeared during the
1. Permian Period. 2. late Triassic Period. 3. Cretaceous Period. 4. Cenozoic Era.
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The earliest mammals
1. 2. appeared about 65 million years ago and had simple teeth. were large and resembled modern elephants. were small and probably were most active during the daytime. probably were nocturnal and ate insects.
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In mammals, the amount of water in the body is controlled mainly by the
1. 2. 3. 4. kidneys. diaphragm. heart. lungs.
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Mammals are characterized by each of the following EXCEPT
1. 2. 3. 4. mammary glands. hair. endothermy. three-chambered hearts.
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1. 2.
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The volume of the chest cavity increases when
1. the rib cage lowers. 2. air leaves the lungs. 3. the diaphragm contracts. 4. the bottom of the chest cavity moves upward.
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Mammals that have baleen feed on
1. 2. 3. 4. insects. nectar. plankton. fruit.
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Which body system includes the rumen?
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3from their bodies when necessary, some mammals use their
1. 2. 3. 4. external body hair. subcutaneous fat. sweat glands. high rate of metabolism.
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Which organ is used by a cow to feed her newborn calf?
1. 2. 3. 4. mammary gland placenta marsupium rumen
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To determine whether a vertebrate is a bird or a mammal, it would be useful to know if it 1. has a fourchambered heart. 2. breathes air. 3. has hair. 4. is an endotherm.
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The mammalian circulatory system consists of
1. 2. one loop powered by a fourchambered heart. two separate loops powered by a fourchambered heart. two separate loops powered by a three-chambered heart. four separate loops powered by a twochambered heart.
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Which part of a mammal’s brain contains a well-developed cerebral cortex—the center of thinking? 1. medulla oblongata 25% 25% 25% 25% 2. spinal cord 3. cerebrum 4. cerebellum
1. 2. 3. 4. respiratory circulatory excretory digestive
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Which sequence correctly describes the path of newly swallowed plant food through the digestive tract of a cow?