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Populations
A group of the same species in a community
Communities
A group of populations of two or more species living in the same area.
True predators
They hunt and kill their prey e.g lions, barn owls and whales
Parasites/grazers
The predator is still hunting and feeding on the prey but it doesn't kill the prey. Parasites generally have a relationship with the prey, grazers normally don't. (Flea=parasite, mosquito=grazers)
Parasitoids
Live off the prey but differ from parasites as they normally kill their prey (eventually). E.g the wasps in the Holly leaf miner
Obligate parasites
A parasite that has to have a relationship with the host for its life cycle to continue.
Decomposer
Break down dead organisms with enzymes e.g fungi, bacteria
Detritivore
Consume decaying organisms e.g worms, millipedes, wood lice
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