Controlled experiments are usually conducted with:

individuals
large groups
small groups
medium-sized groups

What event started the space race and made americans feel their security was threatened a.) alan shepard's suborbital flight. b.) the launch of sputnik c.) the launch of explorer d.) the cuban missle crisis

What event led stephen decatur to burn the u.s. warship philadelphia?

What did truman suggest to stalin at the potsdam conference regarding reparations from germany