Make a prediction: During the first trial, you will not be able to see how many people have the disease until the end. If no students are immune, how many do you think will have the disease at the end? out of 20

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.

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