An experimental study is conducted examining the relationship between drinking caffeine and reaction time. participants given caffeine by the experimenters in different amounts, and then are assessed on various tests of reaction time. in this study, the amount of caffeine that a participant drinks is the

Micah is studying child behavior in playgrounds throughout the world. he wants to see how the children react when teachers select the same child to be the first to use each piece of equipment. which approach is micah is using?

What makes water a renewable source

For 50 pointsfredrika's science teacher asked her to bring in three abiotic items from her backyard ecosystem. which of the following groups of items should she bring? a. a lightning bug, a plug of grass, and a wormb. a smooth rock, some red dirt, and an empty bird's nestc. a ladybug, a spider, and some water from a mud puddled. a caterpillar, a pine cone, and a piece of a robin's egg