Which type of molecule reinforces the shells of forams?

a. calcium carbonate
b. hydrogen sulfide
c. copper sulfate
d. silica


Ans: a. calcium carbonate

Biology & Microbiology

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Indicate whether the statement is true or false.

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When the concordance rate of a trait is significantly higher in identical twins than it is in fraternal twins, we can conclude that:

A. the trait has a strong genetic component. B. the trait has a strong environmental component. C. the trait has a strong genotype-byenvironment interaction. D. the trait has a strong norm of reaction. E. the trait has both a strong genetic component and a strong norm of reaction.

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The best way to prevent desertification is to avoid farming in areas that are subject to __________. Fill in the blank(s) with the appropriate word(s)

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Circular DNA molecules found in nature are

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Biology & Microbiology