Which best describes how decomposers recycle energy in an ecosystem? A.
Decomposers break down energy sources within the ecosystem.

B.
Decomposers provide energy directly to producers in an ecosystem.

C.
Decomposers provide energy directly to consumers in an ecosystem.

D.
Decomposers break down decayed matter and return the energy to the ecosystem.

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.