Introduction:
Mammals are animals with hair and mammary glands. Young mammals are fed milk from their mother's special mammary glands. In addition to these characteristic milk glands, mammals are characterized by a number of other distinctive features. Although it has disappeared in many whales, hair is a typical mammalian trait. The lower mammalian jaw is clamped directly to the skull instead of through a separate bone (quadrate) as in all other vertebrates.
Answer to Problem 1STP
Correct answer :
The correct answer is option (B) endothermy.
Explanation of Solution
Explanation/justification for the correct answer :
Option (B) endothermy. Mammals are endothermic, which means they generate internal body heat. The body heat source is internal- the result of heat generated by a high
Explanation for incorrect answer :
Option (A) hair. The hair of mammals acts as insulation, sensory devices, camouflage, and waterproofing. So, this is an incorrect answer.
Option (C) four-chambered heart. Birds and mammals possess a four-chambered heart. So, this is an incorrect answer.
Option (D) internal fertilization. The internal fertilization takes place in all organisms except in fish. So, this is an incorrect answer.
Chapter 33 Solutions
Biology Illinois Edition (Glencoe Science)
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