Which situation would result in a population represented by an inverted triangular population pyramid, which is heaviest at the top?
A) rapid population growth
B) population stabilization
C) a "boom and bust" cycle
D) a population decline
D
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Heirloom plants are treasured for their flavorful produce and true-breeding progeny that allow gardeners to avoid repeatedly purchasing seed from agribusiness conglomerates. What special effort is required to save seed from heirloom biennials such as carrots?
A. Since carrots produce large roots, they do not devote many resources to seed development. The roots must be trimmed before collecting seed. B. Since carrots build up so much beta-carotene, they do not devote many resources to seed development. A yellow carrot variety will produce better seeds than a darker one. C. Since carrots are related to wild weeds, they are often cross-pollinated. The green top must be bagged to ensure self-pollination. D. Biennials do not produce seed until the second year of growth. Although carrot roots are normally harvested after one season, they must be allowed to grow another year for seed collection. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about biennials? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
____ allow(s) land animals to exchange gases with air across a moist surface
a. Gills b. Moist skin c. A digestive system d. Lungs e. Nasal passages
Astrobiology seeks to answer all of the following
questions EXCEPT a. What is necessary for life to persist.. b. Is there life on other planets. c. What conditions allowed life to form on earth. d. Can we colonize other planets with life from earth. e. All of these are true.
Crossing over
A) is followed immediately by separation of each of the chromatids. B) prevents genetic recombination. C) results in only one exchange per homologue. D) increases variability in gametes. E) occurs between sister chromatids.