What do producers use as source of energy?

producers use photoenergy (sunlight) as a source of energy. producers are autotrophic and make their own energy with a couple things co2 (carbon dioxide), water h2o (water) and photoenergy (sunlight). Their food source is glucose.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).