The correct answer is - different kind of living organism of the ecosystem of the school’s playfield
Explanation:
A biotic factor of any ecosystem or area are all the living organism including bacteria, microbes, plants, animals and decomposers. The biotic factor interact with one another and abiotic factors of the ecosystem.
In this sentence there is looking for study the different kinds of living organisms of the ecosystem of the school’s playfield.
Its fitness would be lower than other strains that lack resistance because it is spending energy that the resistant strains can use for other purposes, such as reproduction.
