Given a scientific passage and an answer, generate a question for the given answer.

[Q]: Passage: solid waste that remains after food is digested and is eliminated from the body through the anus. Answer: solid
[A]: What type of waste is eliminated from the body through the anus?

[Q]: Passage: Describe hurricane formation and the damage they cause. Answer: bacteria
[A]: Yogurt is made with milk fermented with what?

[Q]: Passage: Every split second that sunlight hits that leaf, photosynthesis is initiated, bringing energy into the ecosystem. It could be said that this is one of the most important - if not the absolutely most important - biochemical reactions. And it all starts with the leaf. Answer: sunlight
[A]:
Photosynthesis is initiated by what hitting plants?