Which of these characteristics first developed in reptiles?

A. skull and vertebral column
B. animals living completely on land
C. scales on skin
D. amniotic egg
E. four-legged body


Answer: D

Biology & Microbiology

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a. a b. b c. c d. d e. e

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Skeletal muscle contraction is stimulated by the neurotransmitter ______, which is released by nerves at the neuromuscular junction

a) acetylcholine b) nitric oxide c) dopamine d) glycine

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What will be an ideal response?

Biology & Microbiology