Simple diffusion: requires energy utilizes proteins to move molecules across a membrane moves molecules against a concentration gradient cannot occur without a membrane present does not require energy

Answer;
Simple diffusion does not require energy.

Explanation;
Passive transport is a type of transport that does not require energy since it lets diffusion move molecules only down their concentration gradient.
Simple diffusion, osmosis, and facilitated diffusion are examples of passive transport. 

Droughts cause very arid places such as a desert

Sleep abnia or hyfromortisyndrone