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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 »

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The difference between internal and external mail is the location of the intended recipient. Internal mail is communication via paper mail or email that is within a company. External mail is communication via mail or ema... More »

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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 »

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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 »

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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 »

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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 »

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Blood transports numerous substances throughout the body, including medications, water and enzymes. Blood is the primary system by which any natural or foreign substance is moved through the body system. More »

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