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Larvae of many marine invertebrate species delay their metamorphosis into juveniles when cues signaling an appropriate juvenile environment are absent, thereby increasing their likelihood of thriving as juveniles and of ultimately reaching adulthood. Nevertheless, delayed metamorphosis has potential costs for juveniles, including reduced growth and increased mortality. Nearly all evidence of such costs involves species whose larvae do not feed but rather subsist on stored nutrients, indicating that insufficient energy reserves may be an underlying cause of these costs. Supporting this hypothesis are laboratory studies showing that in a certain bryozoan, the prolonged larval swimming that results from delayed metamorphosis is associated with size reductions in the juvenile feeding organ (the lophophore) and that one factor influencing the size of juveniles of certain barnacle species is how long larvae delay metamorphosis.However, other studies show that while significantly fewer juvenile Capitella worms survived to adulthood when metamorphosis had been delayed, prolonged larval swimming had no significant effect on juvenile size, suggesting, perhaps, that in some species, factors other than insufficient energy reserves account for the negative effects of the larval stresses that result from delayed metamorphosis.
[填空 ]真题1300题 -8954
Having an intense and long-standing culture of (i)_____, the company understandably has a reputation as the supreme corporate (ii)_____. But even by these standard, the degree of secrecy surrounding the company’s most recent research is (iii)_____.
[阅读&逻辑 ]经典真题300篇 -8953
According to the passage, the “shifting-baseline syndrome” is a result of which of the following?
[阅读&逻辑 ]经典真题300篇 -8952
Which of the following is an assumption on which the argument depends?
[阅读&逻辑 ]经典真题300篇 -8951
According to the passage, Sinodonty and Sundadonty differ from one another in that Sinodonty
[阅读&逻辑 ]经典真题300篇 -8950
The passage implies that Turner’s conclusion regarding the origins of most Native American populations is based in part on which of the following findings?
[阅读&逻辑 ]经典真题300篇 -8949
In the argument given, the two highlighted portions play which of the following roles?
[阅读&逻辑 ]经典真题300篇 -8948
In the context in which it appears, “appreciation of” most nearly means
[阅读&逻辑 ]经典真题300篇 -8947
According to the passage, critics approach Jane Austen’s work in biographical or historical ways for which of the following reasons?
[阅读&逻辑 ]经典真题300篇 -8946
Which of the following can be inferred regarding the case of Baker v. Carr?
[阅读&逻辑 ]经典真题300篇 -8945
The author of the passage uses the analogy of the archaeology most probably in order to
[阅读&逻辑 ]经典真题300篇 -8944
It can be inferred that the author of the passage would agree with which of the following claims about The Cry?
[阅读&逻辑 ]经典真题300篇 -8943
The passage presents which of the following as evidence in favor of Fielding and Collier’s having collaborated in writing The Cry?
[阅读&逻辑 ]经典真题300篇 -8942
Which of the following, if true, most strongly supports the proposed explanation?
[阅读&逻辑 ]经典真题300篇 -8941
Which of the following most logically completes the argument?
[阅读&逻辑 ]经典真题300篇 -8940
The primary purpose of the passage is to
[阅读&逻辑 ]经典真题300篇 -8939
Which of the following, if true, most logically completes the argument?
[阅读&逻辑 ]经典真题300篇 -8938
Which of the following can be inferred about the studies mentioned in the highlighted portion of the passage?
[阅读&逻辑 ]经典真题300篇 -8937
In the context in which it appears, “ordered” most nearly means
[阅读&逻辑 ]经典真题300篇 -8936
According to the passage, which of the following statements about ant interactions is true?
[阅读&逻辑 ]经典真题300篇 -8935
The author of the passage mentions conservatives in the highlighted sentence primarily in order to