This sounds like a homework or test question. You would have to consult whatever course material you are studying for the answer.
What are two ways that's scientists can study earths climates history
Genealogy, or the study of family history and backgrounds, is a pretty popular hobby. Probably 1 in 5 American families has at least one or two amateur geneaologists.
Norms in society are enforced through social sanctions, such as praise for conforming behavior and ostracism for deviant behavior. Additionally, legal sanctions, such as fines or imprisonment, may also be used to enforce norms in society.
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The two best ways to learn about God is by reading the bible and by joining a church for bible study.
pressure and heat, by greek changing
Extracellular digestion and intercellular digestion.
Bacterial toxins and direct tissue destruction
two types of vibration on woodwind are made from double reed and reed