The first vertebrates appear in the fossil record during the
A. Cambrian Period.
B. Carboniferous Period.
C. Triassic Period.
D. Devonian Period.
E. Proterozoic Era.
Answer: A
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During the S period of interphase
(a) cell growth takes place. (b) nothing occurs because this is a resting period. (c) chromosomes divide. (d) synthesis (or replication) of the nucleoproteins takes place.
Vibrio cholerae produces a toxin that destroys the intestinal epithelium. This leads to massive diarrhea; the diarrhea can kill the human via dehydration but helps the bacteria spread and colonize other humans. What is this relationship?
A. Mutualistic B. Commensalistic C. Symbiotic D. Atavistic 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 symbioses? How does it relate to the question? · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
Which of the following gives rise to the embryo
during human development? a. trophoblast b. amnion c. inner cell mass d. chorion e. placenta
What phenomena tends to increase genetic variation in a population?
A. Genetic drift B. Founder effect C. Population bottleneck D. Assortative mating E. Gene flow