Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[Q]: Digestion begins in the gastrovascular cavity.
[A]: Where does digestion begin?


[Q]: Comparing genome sequences provides clues to evolution and development.
[A]: Comparing what sequences provides clues to evolution and development?


[Q]: Like all tetrapods except birds and mammals, frogs possess a heart with three chambers.
[A]:
Like all tetrapods except birds and mammals, frogs possess a heart with what structure?