| A | B |
|---|
| asexual reproduction | reproduction in which a single parent produces offspring that are identical to the parent |
| sexual reproduction | reproduction in which two sex cells join to form a unique individual |
| egg | sex cell produces by a female |
| sperm | sex cell produces by a male |
| zygote | a fertilized egg |
| external fertilization | fertilization of an egg by sperm that occurs outside the body of a female |
| internal fertilization | fertilization of an egg by sperm that occurs inside the body of the female |
| testes | organs in the male reproductive system that make sperm and testosterone |
| puberty | the time of life when the sex organs become mature |
| vas deferens | the tube in males where sperm in mized with fluids to make semen |
| semen | a mixture of sperm and fluids |
| penis | the male reproductive organ that transfers semen into the female's body during sexual intercourse |
| ovaries | in animals, organs in the female reproductive system that produces eggs |
| fallopian tube | the tube that leads from an ovary to the uterus |
| uterus | an organ in the female reproductive system where a zygote grows and develops |
| vagina | the passageway in the female reproductive system that receives sperm during sexual intercourse |
| infertile | the state of being unable to have children |
| embryo | an organism in the earliest stage of development |
| implantation | the process in which an embryo embeds itself in the lining of the uterus |
| placenta | an organ that provides a developing fetus with nutrients and oxygen from the mother |
| umbilical cord | a cord that connects the embryo to the placenta |
| fetus | an embryo during the later stages of development within the uterus |
