Final answer:
Carlos's life started with the fusion of an egg from his mother and a sperm from his father, creating a zygote that developed into a baby.
Step-by-step explanation:
Carlos began life with the union of a egg from his mother and a sperm from his father. This is the fundamental process of human reproduction where the female gamete (egg) and the male gamete (sperm) combine during fertilization to form a zygote. The zygote then develops into an embryo, which eventually grows into a baby.