Multiple choice

_______________is responsible for variation within a species.

  1. sexual reproduction

  2. adaptation

  3. mutation

  4. sexual reproduction and mutuation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Both sexual reproduction (which creates new genetic combinations) and mutation (random changes in DNA) are responsible for variation within a species. Sexual reproduction alone is incomplete because it doesn't create truly new alleles, and mutation alone only accounts for some variation. Note: there is a typo in 'mutuation' in option D.

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