Can someone me with this science question? (the discussion question)

Which of these statements are true about scientific theories and hypothesis

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen

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