1. hormone secretion 2. metamorphosis 3. fertilization 4. cell division

some one celled organisms reproduces by binary fission which is a process of cell division. The answer is 4.

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).

fossil's are like over rated rocks like low key not gonna lie i don't get why we can't just call them old rocks like for real i mean i call my grandpa and grandma that smh