Which of the following is considered to be a plant behavior?
A. response to sunlight.
B. response to plant hormones.
C. response to touch.D.
response to gravity.
E. all of the choices.
E. all of the choices.
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What is the predominant hypothesis for why animals only appeared in the fossil record about 3 billion years after life originated?
A. There were animals 3 billion years ago; they just weren't fossilized. B. Animals are warm-blooded; the ocean was too cold for animals to evolve 3 billion years ago. C. Animals have higher metabolisms, and animal diversification and evolution didn't really happen until there was sufficient oxygen in the atmosphere. D. Animals are heterotrophic and couldn't evolve until there were enough photosynthetic organisms on Earth to support being eaten by animals.
Some studies suggest that, as global warming progresses, tropical lowland trees may be limited in their
ability to move northward because of ____.
a. predicted desertification of temperate areas b. temperatures in the north still being too low c. flooding of coastal areas d. extreme weather events like hurricanes and blizzards e. development and habitat loss
Prolactin
a. stimulates the mammary glands to produce milk. b. causes the development of breasts and other secondary sexual characteristics in the male. c. acts in concert with FSH to produce milk. d. has secondary effects on reducing the size of the uterus after birth. e. is secreted only after the flow of milk has begun after delivery of the child.
Diffusion is a process by which a substance:
A) goes down its concentration gradient. B) is at equilibrium. C) goes from lesser to greater concentration. D) goes up its concentration gradient.