The secretion of tears, milk, sweat, and saliva are functions of what tissue

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?

Were does condensation occur? a) hydroshereb) lithosherec) boishered) atmosphere

How does human environment effect the biosphere