Given a scientific question, generate a correct answer to it.
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Question: Electrons in covalent compounds are shared between the two atoms, unlike the case in what type of bonds?

Answer: ionic bonds

Question: Photoautotrophs and chemoautotrophs are two basic types of what?

Answer: autotrophs

Question: If a human only has 45 chromosomes it is most likely due to a mistake during what?

Answer:
meiosis