What route does blood follow in a fish?
- Agills $\rightarrow$ heart $\rightarrow$ body $\rightarrow$ gills
- Bbody $\rightarrow$ gills $\rightarrow$ heart $\rightarrow$ body
- Cheart $\rightarrow$ gills $\rightarrow$ body $\rightarrow$ heart
- Dheart $\rightarrow$ body $\rightarrow$ gills $\rightarrow$ body