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The first living organisms are believed to have appeared on Earth about 3 1/2 ___ years ago.

Your friend says, “Giraffes stretched their necks while reaching for higher leaves; as a result, their offspring inherited longer necks.” Which statement is the best response to correct your friend’s misconception?

The new nuclei produced when unstable nuclei undergo radioactive decay is referred to as the _____ .

Silver, Ag, belongs to what period of the periodic table?

Eighteen students in a class will get this question correct. If that represents 45% of the class, how large is the class?

Which of the following pairs are about equal in mass?

Which of the following would be the correct symbol for an americium-243 nucleus using the  symbolism?

Manganese can undergo several types of radioactive emission. In which type of decay does the following reaction occur?  

Which of the following is a representation of a p orbital?

As two clear liquid solutions are thoroughly mixed, a red solid forms. This change is most likely _____.