Apopulation that is small, but more than “endangered” is considered to be a) extinct b) alarmed c) threatened d) scarred

Describe five factors that influence the value of fuel

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.