An inference . A) is a possible explanation for events using prior knowledge B) explains if a hypothesis is or is not valid C) is made independent of observation or prior knowledge D) can be either qualitative or quantitative

It is A.

Explanation:

An inference is a possible explanation for events using prior knowledge

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when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.