Answer:I believe B:The Phosphate Group
Explanation:
The diagram is weird. Sorry I cant answer
Answer:
Gas exchange during respiration occurs primarily through diffusion. Gas molecules move from a region of high concentration to a region of low concentration. Blood that is low in oxygen concentration and high in carbon dioxide concentration undergoes gas exchange with air in the lungs.
Explanation:
Answer:
living, nonliving
Explanation:
all living and non living things in an area make up an ecosystem
