Aconsists of all the individuals of a given species that live and reproduce in a particular place

Population

Explanation:

Population is a group of individuals that live in the same geographical area which have the ability to interbreed because they belong to the same species. So organisms of the same species when live in a particular area are considered in population but members of the same species that are geographically isolated and can not interbreed do not make a population.

Many population comes together to form community and many communities together forms an ecosystem. An ecosystem is a functional unit which is made up of many communities with interacts with its physical environment. So the correct answer is population.

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."