5.1

● Biotic factors

● Abiotic factors

● Ecosystem

● Community

● Population

● Organism

● Niche

● Producer

● Consumer

● Decomposer

● Herbivore

● Carnivore

● Resources

5.2

● Food Chain

● Food Web

● Energy Pyramid

5.3

● Competition

● Predator

● Prey

● Symbiosis

● Pollutant

● Mutualism