Answer:
It will make the dad's sperm XY. I think I am not sure.
Explanation:
The purines-adenine and guanine
Answer:
absence of that solute from the urine
Explanation:
Answer: Scientists think that early amphibians had lungs becuase they needed efficient oxygen uptake to support their metabolism. Higher rates of metabolism are needed on land, becuase of this scientist think that early amphibians breathed air with lungs.
Explanation: