In some animals, gas exchange takes place across the skin. Which features are most likely to be found in the skin of these animals?
- Asurface area: large; skin: thick; blood supply: poor
- Bsurface area: large; skin: thin; blood supply: good
- Csurface area: small; skin: thick; blood supply: poor
- Dsurface area: small; skin: thin; blood supply: good