Oysters and many other mollusks produce many offspring of which only a few survive to adulthood and then have little risk of predation with their strong adult shells. Oysters are an example of an organism with a type ______ survivorship curve.
A. 0
B. I
C. II
D. III
E. IV
Ans: D. III
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A __________ is a confined fluid upon which
muscle contractions act. Fill in the blank(s) with the appropriate word(s).
The length of a DNA sequence is _____ than the mature mRNA transcribed from it, because
A. shorter it does not contain exons. B. equal it was transcribed from the DNA sequence. C. longer it does not contain introns. D. shorter each codon of three bases encodes only one amino acid. E. longer each codon of one amino acid encodes three bases.
Figure 42.11
Use the figure above showing human embryonic developmental day 14 to answer the following question.
The structure that later becomes part of the placenta is indicated by ____.
A. A B. B C. C D. D E. E
Acidithiobacillus ferrooxidans is used for the recovery of ________ from ore
A) sulfur B) copper C) iron D) sulfuric acid E) gold