3. Four levels and six different groups of organisms are described in the popup windows. What kinds of behaviors and interactions among the organisms of this habitat can you observe in the animated snapshot of the reef environment?

it is very expensive

explanation:

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.