Which option gives the correct cause-and-effect relationship for Variation and evolution, Evolution: students must state that living species evolved from simple life forms that first developed more than three billion years ago.

The correct option is Correct cause and effect: Mitosis maintains chromosome number; meiosis halves chromosome number. This matches Evolution because students must state that living species evolved from simple life forms that first developed more than three billion years ago.. It is the only option that keeps Mitosis vs meiosis separate and answers the approved learning objective in Evolution.

The correct option is Correct cause and effect: Mitosis maintains chromosome number; meiosis halves chromosome number. This matches Evolution because students must state that living species evolved from simple life forms that first developed more than three billion years ago.. Correct cause and effect: Mitosis maintains chromosome number; meiosis halves chromosome number. This matches Evolution because students must state that living species evolved from simple life forms that first developed more than three billion years ago. is correct because Mitosis maintains chromosome number; meiosis halves chromosome number. The learning objective says students must state that living species evolved from simple life forms that first developed more than three billion years ago, so the answer must stay inside Evolution. 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..