How does crossing over during meiosis I increase
genetic diversity?

. During prophase of meiosis I, the double-chromatid homologous pairs of chromosomes cross over with each other and often exchange chromosome segments. This recombination creates genetic diversity by allowing genes from each parent to intermix, resulting in chromosomes with a different genetic complement.

Explanation:

During meiosis, homologous chromosomes (1 from each parent) pair along their lengths. The chromosomes cross over at points called chiasma. At each chiasma, the chromosomes break and rejoin, trading some of their genes. This recombination results in genetic variation

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b. the carbon cycle ensures living things have a source of hydrogen

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.