Suppose 10, 000 units of energy are available at the level of the grasses. What is the total number of energy units available by the time energy reaches the owl?

a) 10 units

Explanation:

less energy the higher it gets so i divided 10,000 by the amount ex: grass is 10,000, grasshopper is 1,000, shrew is 100 so the owl is 10 units.

(this is my best educated guess)

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.