Sperm: Meaning, Structure, Fertilization, Fertility, and Pregnancy
Sperm are reproductive cells produced mainly in the testicles that carry genetic material and may fertilize an egg.
Ovum: Meaning, Egg Cell, Fertilization, and Human Reproduction
An ovum is a reproductive egg cell that develops in an ovary and may combine with sperm during fertilization to form a zygote.
Embryo: Meaning, Development, Pregnancy Stages, and Usage
An embryo is a human, animal, or plant at an early developmental stage; in humans, the embryonic period lasts through eight weeks after fertilization.