How much larger are the brains of Homo sapiens than the brains of the Homo species that immediately preceded us?

Classical conditioning can help to explain drug tolerance

a. True b. False Indicate whether the statement is true or false

When a researcher conducts an experiment, and is fairly certain that changes in the independent variable caused changes in the dependent variable, that experiment is said to be high in ____________________

Fill in the blank(s) with correct word