As creatures become adapted to a particular environment, natural selection can cause a decrease in genetic diversity throughout the population. this type of natural selection is

Natural selection favours those individuals (or their phenotypes) that contribute more to the gene pool of the next generation, i.e. that are best adapted to their environment. Mutations form the "fuel", in that they generate genetic variation on which selection can subsequently act. Migration and genetic drift bear on populations ...

The main role of dna in the  cell is the long-term storage of information. it is often compared to a blueprint, since it contains the instructions to construct other components of the  cell, such as  proteins  and rna molecules.the main function of rna is to carry information of amino acid sequence from the genes to where  proteins  are assembled on  ribosomes  in the  cytoplasm. mark brainliest, my work is good.