Acell undergoes a nuclear division and separation of the cytoplasm, after which the number of cellular organelles is doubled, and cell size increases greatly. however, a malfunctioning enzyme (helicase) prevents separation of the dna strands.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

option a and d is the correct answer

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