Biology

The primitive streak in a bird is the functional equivalent of A) the lip of the

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In all vertebrate animals, development requires A) a large supply of yolk. B) an

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The least amount of yolk would be found in the egg of a A) bird. B) fish. C) fro

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A primitive streak forms during the early embryonic development of A) birds, but

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Extraembryonic membranes develop in A) mammals, but not birds or lizards. B) bir

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At the time of implantation, the human embryo is called a A) blastocyst. B) gast

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Uterine implantation due to enzymatic digestion of the endometrium is initiated

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In placental mammals, the yolk sac A) transfers nutrients from the yolk to the e

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Animals with reproduction dependent on internal fertilization need not have A) a

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Which of the following patterns of reproduction are found only among invertebrat

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Evidence that parthenogenic whiptail lizards are derived from sexually reproduci

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All individuals of a particular species of whiptail lizards are females. Their r

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For water fleas of the genus Daphnia, switching from a pattern of asexual reprod

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Environmental cues that influence the timing of reproduction generally do so by

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Sexual reproduction A) allows animals to conserve resources and reproduce only d

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Sexual reproduction patterns include the example of A) fragmentation. B) budding

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Asexual reproduction results in greater reproductive success than does sexual re

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Genetic mutations in asexually reproducing organisms lead to more evolutionary c

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An advantage of asexual reproduction is that A) asexual reproduction allows the

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One of the evolutionary "enigmas," or unsolved puzzles, of sexual reproduction i

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Regeneration, the regrowth of lost body parts, normally follows A) all types of

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Like many other fishes, bluehead wrasses utilize harem mating as they reproduce

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In close comparisons, external fertilization often yields more offspring than do

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Internal and external fertilization both A) produce single-celled zygotes. B) oc

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Organisms with a reproductive pattern that produces shelled amniotic eggs genera

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