Homo erectus and the modern humans differ in

A. opposable thumbs.
B. their brain size.
C. their upright posture.
D. living as tribes.
E. social behavior.


Answer: B

Biology & Microbiology

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Hormones released by endocrine glands function as signal molecules

A. true B. false

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____ tissue allows the body to detect and respond to internal and external changes

a. Nervous b. Adipose c. Epithelial d. Connective e. Skeletal muscle

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Cnidarians have _______

Fill in the blank(s) with the appropriate word(s).

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Over time, a sensory neuron will decrease its responsiveness to a specific signal. This

A. accommodation B. appreciation C. adaptation D. alleviation

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