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

Q: Passage: Athletics are very competitive these days at all levels, from school sports to the pros. Everybody is looking for that edge that will make them faster, stronger, more physically fit. One approach taken by many athletes is the use of amino acid supplements. The theory is that the increase in amino acids in the diet will lead to increased protein for muscles. However, the only real benefit comes to the people who make and sell the pills. Studies have not showed any advantage obtained by the athletes themselves. You're much better off just maintaining a healthy diet. Answer: a healthy diet

A: Which is the best way to maintain a strong, fit body?
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Q: Passage: The embryo develops from a fertilized egg. While still inside the seed, the embryo forms its first leaf (cotyledon) and starts to develop a stem (hypocotyl) and root (radicle). Answer: cotyledon

A: What is the name of the first leaf developed inside an embryo?
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Q: Passage: Malaria is common in tropical and subtropical climates throughout the world (see Figure below ). In fact, malaria is one of the most common infectious diseases on the planet. Malaria is also a very serious disease. It kills several million people each year, most of them children. Answer: tropical and subtropical

A:
What type of climates is malaria commonly found in?
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