sperm and egg - of sperm fertilizing the egg, close up view

anatomy biology body cell close competition dna egg ejaculate ejaculation female fertile fertility fertilization fertilize fertilizing genetic genital health human illustration inside journey macro male man medical medicine micro microbiology microscope microscopic organ organs ovulation ovum penetration pregnancy procreation red reproduction reproductive science semen sex sperm spermatozoa spermatozoon spermicide spermotozoon swim uterus view vitro woman womb