What happen to the absorbance of a sample as cells multiply

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

19. scientists use meteorites that hit earth to provide evidence of the composition of earth's interior because they hypothesize that

Describe the function of the endomembrane system? what organelles are involved?