PLSSS HELP WITH THIS IMMEDIATELY only answer if u know. i’ll be giving brainiest if u don’t leave a link.

Where do homologous chromosomes exchange genetic material through crossing over?               a.  chlorophyll    b.  centrosomes    c.  centromeres    d.  chiasma

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite

Which characteristics are typical of a human population in the postindustrial stage?