Chimpanzees and humans last shared a common ancestor about ____________ years ago
A. 1 to 2 million
B. 6 to 7 million
C. 10-11 million
D. 6 to 7 billion
B
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Explain the significance of what Loewi observed in his experiment with the two frog hearts.
A. It showed that neurons communicate with muscle by electrical signals. B. It suggests that a chemical substance released from the first heart, when added to the second heart, reproduced the effects of electrical stimulation. C. It suggests that all vertebrate hearts receive both inhibitory and excitatory signals from different nerves. D. It showed that nerves have a direct electrical effect on heart muscle.
A small mass of tissue with many lymphocytes that filters lymph is the:
a. thymus b. SA node c. spleen d. lymph node e. lymphatic duct
Schooling is
a. a feeding behavior. b. fin nipping. c. fish swimming in synchrony. d. a mating behavior.
Grazing ungulates are relatively common and burrowing rodents are relatively rare in temperate grasslands
Indicate whether the statement is true or false