It tells about antigens. If blood has Type A antigen, or Type B antigen, or both of them, or neither of them.
Answer:
mouth ⇒ oesophagus (gullet, food pipe) ⇒ stomach ⇒ duodenum ⇒ ileum ⇒ colon ⇒ rectum ⇒ anus
Explanation:
C is the answer ik a lot of science
RNA viruses can copy themselves which is harder for scientists to give an accurate conclusion to solve them.
