articles

The difference between internal and external fertilization is that internal fertilization occurs inside the body, whereas external fertilization happens outside the body. Fertilization is the process by which a sperm cel... More »

www.reference.com Science Biology

Animals that live in water, such as amphibians and fish, use external fertilization. The term refers to the process by which the egg is fertilized by the sperm in an open environment and not within the bodies of the orga... More »

www.reference.com Science Biology Zoology

Examples of external fertilization can be seen in frogs, some marine invertebrates and many types of fish. External fertilization happens when sperm fertilize eggs outside of the body of the female animal. Often, in orde... More »

www.reference.com Science Biology
similar articles

After fertilization, the cells in the zygote divide rapidly to form a morula, which becomes the embryo after approximately five days. The fetus is present about eight weeks after the fertilization takes place. More »

www.reference.com Science Biology

Examples of external fertilization can be seen in frogs, some marine invertebrates and many types of fish. External fertilization happens when sperm fertilize eggs outside of the body of the female animal. Often, in orde... More »

www.reference.com Science Biology

Menstrual periods allow the female body to discharge excess uterine tissue and eggs when fertilization doesn't occur, according to KidsHealth. In preparation for ovulation, the hormone estrogen causes the uterine lining ... More »

www.reference.com Health Women's Health Menstruation

Hormones are called chemical messengers because they are chemical agents that travel around the body to tell specific cells to perform a specific action. The term hormone describes a variety of chemicals that perform the... More »

www.reference.com Science Biology