My best answer would be C I hoped I helped sry if you get it wrong
Answer:
1.It helps to digest our food.
2.It is used as antibiotics to treat bacterial infection and disease.
3.It is used by humans to create food products such as cheese, yoghurt, pickles, soy sauce and vinegar.
4.It is use to break down our sewage and to clean up oil spills..
I think it is D. You experience increase in breathing rate to obtain more oxygen which is delivered to cells through the bloodstream
C) The core contains equal amounts of hydrogen and helium
