Ques 1) in what sphere do chemicals have the shortest average residence time? A) biosphere B) lithosphere C) hydrosphere D) atmosphere
__________________
Ques 2) 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

Question

Ques 1) in what sphere do chemicals have the shortest average residence time?   A) biosphere   B) lithosphere C) hydrosphere  D) atmosphere 
__________________
Ques 2) 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