Sexual and asexual reproduction.
Sexual reproduction have more diverse characteristics because 2 parents have 2 different genes. For example if the mother's eye color is blue and short and the dad's eye color is green and tall, it will take half of the mother's gene and half of he dad's gene and will have 50% of each other's gene to make a baby. The baby might have a blue eye color and tall because the mom has blue eyes and dad is tall. If it is asexual reproduction all of us will be the same like the same faces and eye colors and others.