Which option gives the correct cause-and-effect relationship for Variation and evolution, Variation: students must explain that variation may be caused by environmental conditions during development.

The correct option is Correct cause and effect: Mitosis maintains chromosome number; meiosis halves chromosome number. This matches Variation because students must explain that variation may be caused by environmental conditions during development.. It is the only option that keeps Mitosis vs meiosis separate and answers the approved learning objective in Variation.

The correct option is Correct cause and effect: Mitosis maintains chromosome number; meiosis halves chromosome number. This matches Variation because students must explain that variation may be caused by environmental conditions during development.. Correct cause and effect: Mitosis maintains chromosome number; meiosis halves chromosome number. This matches Variation because students must explain that variation may be caused by environmental conditions during development. is correct because Mitosis maintains chromosome number; meiosis halves chromosome number. The learning objective says students must explain that variation may be caused by environmental conditions during development, so the answer must stay inside Variation. The alternative options are wrong because they either claiming meiosis is used for body growth., claiming mitosis produces gametes., or drift away from mitosis questions must focus on identical cells, growth, repair, asexual reproduction, or maintained chromosome number..