What does the immune system do for months or years after the invasion of a certain antigen?

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.

for a different answer set the answer would be because the oxygen in the water had depleted (apex)

answer; benefit; harmed;