In what sphere do chemicals have the shortest average residence time? a) biosphere. b) lithosphere. c) hydrosphere. d) atmosphere. there are 4000 units of energy available to grass at the 1st trophic level of an ecosystem. if the grass is eaten by a mouse & the mouse is eaten by an owl, how many units of energy will be left for the bobcat that eventually eats the owl? a) 4 b) 40 c) 400 d) 2000

I think chemicals have the shortest average residence time in : A. Biosphere

In biosphere, chemical quickly cycled through various process. As the result, it will move from one object to organism and then to another organism

hope this helps

That would be a working theory.

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.