Most elements in nature exist as:

A. mixtures of liquids
B. mixtures of gases
C. mixtures of different isotopes
D. solitary unreactive atoms


Answer: C

Biology & Microbiology

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Which of the following lung volumes change during exercise?

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Genes in euchromatic regions are:a

inhibited. b. duplicated c. actively being transcribed. d. repressed. e. unregulated.

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Bacteriophages may multiply by a(n) __________ pathway in which the new viral particles are made quickly and released by lysis.

Fill in the blank(s) with the appropriate word(s).

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Which scenario describes allopatric speciation?

A) A population of squirrels is separated by the Grand Canyon. The two subpopulations evolve into two distinct species. B) A tetraploid plant species evolves from a diploid ancestor. Both the tetraploid and diploid species are found in the same habitat. C) One population breeds in the fall; another population breeds in the spring. D) A male horse and a female donkey mate, producing a sterile hinny.

Biology & Microbiology