Which of the following is not a characteristic of mammals?

A. They have a two-chambered heart.
B. They have an amnion.
C. They have a skeletal system composed of bone.
D. They have lungs.
E. They are endothermic.


A. They have a two-chambered heart.

Biology & Microbiology

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Neutralizing antibodies are those that function by:

a. attaching to the surface of pathogens and contributing to their destruction by the lytic action of complement. b. binding to and blocking surface receptors for host cells. c. attaching to the surface of pathogens and making the pathogens more amenable to ingestion by phagocytic cells. d. attaching to the surface of pathogens and contributing to their destruction by che-motaxis.

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How does undernutrition impact the human body?

What will be an ideal response?

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Which of the following organisms would be likely to use the least energy per kilogram of body weight to maintain its temperature in a preferred range?

a. a whale in the Arctic Ocean b. a clam remaining submerged at low tide c. a tuna swimming in the deep ocean d. a lizard in a desert environment e. a human in a tropical environment

Biology & Microbiology