Answer:
Crossing over between segments of homologous chromosomes.
Explanation:
Crossing over happens during prophase I of meiosis I
A. lungs, muscles because I went through them one by one and that's the only one that makes sense to me
Hope this helped :D
He should show protons (and neutrons) in the nucleus of the atom.
Teratogens is the right answer i believe<span />
