Early exploration of africa by europeans was hindered by the 1. lack of natural resources in africa 2.alliances between african kingdoms 3.isolationist policies of european monarchs 4. many different physical features of africa

Psychologists studying infant memory want to determine at what age babies can remember specific events. an experimenter uses several puppets to demonstrate a series of actions while the infant watches. after a delay, the experimenter records how many of the actions the child imitates when playing with the puppets. what is the dependent variable?

What percentage of people are left handed?

Spanish for "estate," this was a type of plantation or other economic activity in spain's "new world" colonies.