Given a statement, generate a question such that the answer is contained in that statement.

[Q]: Eggs are often laid by birds in lifeless trees.
[A]: Eggs are often laid by birds in what?

[Q]: Fissures heal when bones resorb and form new bones
[A]: What heals when bones resorb and form new bones?

[Q]: Hives are made on every continent except Antarctica.
[A]:
Hives are made on every continent except what continent?