Dr. su was conducting a study on a new antidepressants. Half of the participants were given the new drugs and the other half were given placebo. what procedure did Dr. su use to treat both groups excatly the same and not inadvertently influence the results

Apopulation is a group of individuals of a single species existing together in an area. a population’s range, the area it occupies, changes over time. populations, in turn, may form a network, or metapopulation, connected by individuals that move from one group to another. within a population, the distribution of individuals can be random, uniform, or clumped, and the distribution is determined in part by the availability of resources. how might the geographic range of a species change if populations could not exchange individuals with each other? how would your answer depend on what type of metapopulation existed?

What role did natural resources play in african politics?

Push-and-pull factors contribute to