Answer:
3
Explanation:
I think it is 3 because all other ones don't effect all types of species while three makes the most sense
The cell is considered to be the most basic living unit.
Some don't have any able to see effects,but some cause diseases
<span>The movement along the concentration gradients allows for the cell to maintain homeostasis. Keeping a cell in the proper conditions inside and out allows for it to function properly and carry out the duties that it is required to do as part of its bodily system.</span>
Crossing-over is the exchange of genetic material between homologous chromosomes. It results in new combinations of genes on each chromosome. When cells divide during meiosis, homologous chromosomes are randomly distributed to daughter cells, and different chromosomes segregate independently of each other.
