Through a series of tests and data
Answer:
12. In our somatic (body) cells, we have 2N chromosomes, but in our sex cells (sperm & eggs), we have half the number of chromosomes, which is N chromosomes
Explanation:
Increases genetic variation, which in and of itself has extreme benefits such as protection against disease, capability to evolve, etc
I think its false because gas exchange can happen in blood also
