They decay. Anything that can grow will eventually start to decay over time. I hope this helps.
I’m pretty sure it’s D, the others don’t make sense??
C. And if the cell is too big, too little material will pass the membrane fast enough to increase the cellular volume (all credit goes to litterally the first website that pops up when using Google jgdibicibsif) I hope this helps (I'm also guessing your taking living environment. Good luck on that UwU) OwO.
The roads might of had been build where an animal was living and there also might be pollution due to the cars.