Multiple Choice
Which type of symmetry is displayed by a jellyfish?
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30. Overview of Animals
Overview of Animals
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Which of the following statements is true about mammals?
A
Mammals have hair or fur at some stage of their life.
B
Mammals are the only animals that can fly.
C
Mammals are the only animals that lay eggs.
D
All mammals are cold-blooded.
Verified step by step guidance1
Identify the key characteristics of mammals. Mammals are a class of animals known for having hair or fur, being warm-blooded, and most give live birth, although there are exceptions like the monotremes (e.g., platypus) that lay eggs.
Evaluate the statement 'Mammals have hair or fur at some stage of their life.' This is a true statement as all mammals have hair or fur at some point, even if it's minimal or only during certain life stages.
Consider the statement 'Mammals are the only animals that can fly.' This is false because while bats are flying mammals, birds and some insects can also fly.
Analyze the statement 'Mammals are the only animals that lay eggs.' This is incorrect because most mammals give live birth, and only a few, like the monotremes, lay eggs. Other animals, such as birds and reptiles, also lay eggs.
Review the statement 'All mammals are cold-blooded.' This is false because mammals are warm-blooded, meaning they can regulate their body temperature internally, unlike cold-blooded animals that rely on external sources for temperature regulation.
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