Answer:
materials move against a concentration gradient
<span>The sum total of all the chemical reactions that occur in organisms is called-</span>Metabolism
Temporary changes would be weather, since it can change at any givin time another example would be tides coming in because they vary by day, or wet sand becoming dry sand!
The immune system, and the excretory system
(Honestly, all of them work to keep us 'healthy', but I believe these are the ones you're looking for)
