Why is this process of moving molecules in and out of cells through a protein channel called "facilitated" diffusion?

Which is an example of a population?

Amarine ecologist has constructed the conceptual model shown in the diagram. what predictions can be made from using this model? where the tertiary consumers get their energy how often primary producers are able to reproduce when bacteria and fungi initiate the process of decomposition whether other secondary consumers are present

Why did the federal government end its support of yucca mountain as a site for long-term storage of nuclear water