If animals are fighting for food (competition) they'll be forced to kill each other or go hungry. Predation is simply when animals kill things for food. So basically it's just a whole lot of killing.
Answer:
abiotic
Explanation:
Fire is not a living thing, and abiotic factors are the factors in an ecosystem that are not-living. Therefore, fire is an abiotic factor in an ecosystem, though is rarely mentioned.
Answer:
Active/passive transport
Explanation:
The cell membrane is semipermeable meaning that is only lets certain things in and out.
Hope this helps. :)