What body system functions in secreting chemicals that act as relatively slow-acting messengers between body parts? select one: a. the nervous system b. the endocrine system c. the lymphatic system d. the cardiovascular system e. the digestive system?

i'm pretty sure it's spores

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).