There are 7.6 Billion people on Earth so idk if u should choose B or not
Answer:
cell theory
Explanation:
cells are the basic unit of structure in organism
There are several stages but the crossing over starts on the second stage. And the actual crossing sides happens on the following stage. Hope this helped :)
Hey there! So, another power house for plant cells maybe the chloroplast! Another idea could also be Vacuoles, and even ribosomes!
Hope I helped! Good luck!