Please answer this: David is a physicist. He teaches school children how matters and energy work. One day he was teaching them about two particles of matter, particle A and particle B. Particle A moves faster, but particle B moves slower. He was showing the children about different characteristics of moving particles. Which particle would have more kinetic energy, particle A or particle B?
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Answer: particle A

Please answer this: Mary had two children. Her firs born was named Bill and was normal, and her second child was named Sam and had Down syndrome. Which child had a nondisjunction of chromosome 21?
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Answer: Sam

Please answer this: Two researches studied adolescents during puberty. Tim studied males, while Dan studied females. Which researcher observed that growth generally remains rapid for several years?
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Answer:
Tim