The number of organisms that the environment in an ecosystem can handle is called its growth rate carrying capacity population density

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Monitor and apply fix up stratorgies

Cold case files recently began re-investigating an old murder case. the murder took place in the park; a young man, james, was hit over the head with a brick and killed. police suspected the jealous former boyfriend of james' wife, karen. whoever killed james may have washed their hands in a near-by bird bath as detectives found blood in the bird bath. since the murder took place before dna fingerprinting was available, the suspected killer, ronnie, went free. detectives are now reviewing the blood evidence using dna fingerprinting. based on the dna fingerprints of all possible suspects, who is james' killer?