Cotyledons, or "seed leaves," absorb food molecules stored in the
A) megaspore.
B) ovary wall.
C) sporophyte.
D) endosperm.
E) gametophyte.
D
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Ocean acidification is caused by ____
a. global warming b. nitrogen fertilizer runoff c. phosphorous fertilizer runoff d. transfer of carbon dioxide from the atmosphere to the ocean e. transfer of carbon dioxide from the ocean to the atmosphere
Scientists are always thinking about ways to improve experimental design. In the text's potato chip experiment, which
of these changes would produce the most effective design?
a. Show a different movie. b. Exclude teenagers as group members. c. Collect uneaten chip remains and weigh them for both groups. d. Provide free drinks before the experiment. e. Use a smaller theater.
If our bodies are capable of secondary responses, how do people contract influenza more than once?
a. Memory cells lose their ability to recognize antigens after six months. b. The affinity of antibodies diminishes in the secondary response. c. New varieties of flu virus continuously evolve. d. Our bodies cannot launch a strong enough immune response against the flu virus. e. There are no effective vaccinations for the flu.
In some areas of the world where there are large numbers of pines, everything is covered in the spring with a yellow dust that turns out, upon examination, to be pine pollen. Why must conifers produce so much pollen, and why do we not see as much pollen
produced by a field of flowers? What will be an ideal response?