When does crossing over occur in meiosis? prophase II metaphase I metaphase II prophase I

crossing over occur in meiosis I in prophase I

Explanation:

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the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

d. planting trees

the trees take in carbon to make oxygen.