X-1 develops new products specifically for the unique needs of athletes in the endurance, outdoors, and health club categories. from a marketing perspective, endurance, outdoor, and health club athletes represent x-1's

sex cells are usually half's then they find another half and make a fertilize egg

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.