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 » Science Biology

While external customers place orders for a good or service and ultimately pay for it, internal customers do not. External customers are also external to the organization supplying the good or service, but most internal ... More » Business & Finance Business Resources

The difference between internal and external development is the fact that internal development refers specifically to sexual organs, while external development refers to the many physical changes that occur in an organis... More » Business & Finance Business Resources Advertising
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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 » 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 » 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 » 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 » Science Biology