Which best describes a population?
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a. the people and animals living in a city
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b. all of the animals in a forest
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c. a group of the same species living together
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d. the total number of babies in a village

The answer is C. A group of the same species living together. This is because the word population generally refers to the number of individuals from a certain species, either in a specific area or in total.

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.