By boiling the bones and teeth of dead animals, it is possible to make a kind of glue. This glue is made from the collagen fibres found in bones and teeth. Which statement describes the changes to collagen that happen when the glue is made?
- AThe fibres of collagen become more coiled.
- BThe fibres of collagen become more flexible.
- CThe helices of collagen molecules unwind.
- DThe molecules of collagen dissolve in water.