Cellular division within the eukaryotic cells requires DNA to condense into the:

A. 30-nm chromatin fiber.
B. 1400-nm chromatin fiber.
C. 300-nm chromatin fiber.
D. 2-nm chromatin fiber.
E. 44-nm chromatin fiber.


B

Biology & Microbiology

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Which of these fly organs, as they exist in the description above, best illustrates an exaptation?

A) vestigial halteres B) halteres C) mouthparts D) eggs

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Under the ___________ , species are identified based on their unique habitat requirements.

A. phylogenetic species concept B. biological species concept C. evolutionary species concept D. ecological species concept E. general lineage concept

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The original source of variation within a population comes from ________

Fill in the blank(s) with correct word

Biology & Microbiology