mother holding a picture of twins fertilized egg

activity after anatomy and asia asian baby beginnings biological biology biotechnology birth cell chinese competition developed dna egg female fertile fertility fertilization fertilized from gene genetic holding horizontal human implant infant japanese life liquid love magnification male medical medicine micro microscope mother motherhood motion new operation ovulation ovule ovum parent penetration picture pregnancy pregnant procreation reproduction research science seed seman sex sexual small sperm spermatozoon test that the tube twins usually vitro