You need to create a mnemonic device, on a piece of blank paper, to help you remember the correct order of the taxonomic levels. Then, draw a picture that relates to it and make it look pretty. After you are done, send me a picture of it.

oxygen +1 most likely

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.