Some herbivore-plant interactions evolved through a series of reciprocal evolutionary adaptations in both species. This process is called
A) herbivory.
B) coevolution.
C) selection.
D) competition.
Answer: B
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A penguin's feet are nearly as cold as ice, while the bird's core body temperature is much higher. Which of the following explains this observation?
A. countercurrent heat exchange between warm blood in arteries and cold blood in veins B. countercurrent heat exchange between warm blood in veins and cold blood in arteries C. blood supply to legs shut off by vasoconstriction D. no muscles in the feet of penguins to generate heat E. heat cannot diffuse from body core to feet because feet are too far away
Which discovery supports the hypothesis that evolution of the lactase-persistence trait was driven by the use of milk in pastoralist cultures?
A. The lactase gene is present both in humans and in domesticated animals B. Ancient pots used to hold milk are about the same age as the lactase persistence mutations. C. Most human cultures today drink milk and most people worldwide are lactase persistent. D. Scientists have identified different mutations that cause lactase persistence.
Which of the following cells can use nonphagocytic means to kill bacteria?
A) eosinophils B) macrophages C) neutrophils D) natural killer cells E) both eosinophils and neutrophils
What surround stomata in plant leaves and can collapse to close stomata and conserve water?