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

Q: Passage: Hinge Joint. The knee joint is a hinge joint. Like a door hinge, a hinge joint allows backward and forward movement. Answer: hinge joint

A: What type of joint is the knee joint?
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Q: Passage: In sexually reproducing organisms, parents pass a copy of each type of chromosome to their offspring by producing gametes. When gametes are fertilized and form offspring, each has a unique combination of chromosomes and genes from both parents. The inherited gene combination determines the characteristics of the offspring. Answer: chromosome

A: In sexually reproducing organisms, parents pass a copy of each type of what to their offspring by producing gametes?
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Q: Passage: Diseases of the cardiovascular system are common and may be life threatening. Examples include atherosclerosis and coronary heart disease. A healthy lifestyle can reduce the risk of such diseases developing. This includes avoiding smoking, getting regular physical activity, and maintaining a healthy percent of body fat. Answer: cardiovascular system

A:
Atherosclerosis and coronary heart disease are examples of what type of body system disease?
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