Control variables HELP ME PLEASEEW 9th grade science btw

Which of the following is a common danger of commercial fishing?

Agene pool: a) is the collection of all the alleles found in a single species b) is the collection of all the alleles found in a single population c) is the collection of all the chromosomes found in a single population d) is the collection of genes in a species that allow the individuals to swim

Drag the tiles to the correct boxes to complete the pairs. match the nitrogenous base of dna with its complement.