The answer is: massive stars create a lot of heavier elements. They produce much of the carbon and oxygen which is hugely important for humans and water respectively.
The answer i know is scientific method
If models let scientists see what could happens to earths climate then when we input different rates of CO2 in the future the model should be able to calculate the futures averages global temperature
D) allow the fetus to receive nutrients and oxygen.
Hope this helps.
(Please mark this brainliest, I would really appreciate it) Thanks!