The time it takes for half of a radioisotope's

atoms to decay
a. cannot be calculated.
b. is used to construct the geologic time scale.
c. is its half-life.
d. is the same for uranium 238 and carbon 14.
e. is all of these


C

Biology & Microbiology

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What will be an ideal response?

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The one-gene:one-enzyme hypothesis emerged from work on which two organisms?

A) Neurospora and Drosophila B) E. coli and humans C) E. coli and yeast D) Drosophila and humans E) All of the answers listed are correct.

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Which of the following is a vascular plant?

a. moss b. fern c. liverwort d. hornwort e. charophyte

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