Why is the flow of energy through an ecosystem considered inefficient?

answer; i believe that the correct answer is ; males are hemizygous for the x chromosome;

hi~~

i would say that hybridization occurs frequently in nature, because there are many types of hybrids that have occurred naturally, such as the mule (male donkey + female horse)

that is wrong, its not thymus.

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.