sperms and a human egg cell

aspiration biology blastocyst cell competition concept egg ejaculation embryo embryogenesis embryology female fertile fertility fertilization fertilize genetic health human illustration insemination life male medical medicine micro microscopic nucleus oocyte ovulation ovule ovum penetration pregnancy procreation red rendered reproduction research science semen semination sex sperm spermatozoa spermatozoid spermatozoon sperms tail winner zygote