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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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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____ 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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