The answer is A. Excretion I hope this helps
It is called hydrosphere
It is the total water in Earth.
Answer: The reason why stem cell research is a big field in biology or even the world is because stem cells might be able to treat degenerative conditions as well as answering questions about human development.
Precipitation<span> is </span>water<span> released from clouds in the form of rain, freezing rain, sleet, snow, or hail.</span>
