Answer:
1. The major difference in fertilization between aquatic and terrestrial animals is the problem of getting the sperm to the egg. It has to swim through a liquid environment which is very easy in aquatic habitats but essentially impossible for terrestrial ones unless the sperm is deposited internally along with some liquid produced by either parent. An alternative is for the male to package the sperm in a casing which the female inserts into an internal cavity where appropriate liquids are secreted.
2. Internal fertilization occurs most often in land-based animals, although some aquatic animals also use this method. There are three ways that offspring are produced following internal fertilization: oviparity, ovoviparity, and viviparity.
3. There is a difference in the types of fertilization among animals because of the female body structure. Depending on the variety of species, there are differences in the uterus of a female animal. Fertilization occurs when a sperm cell meets an egg cell in the fallopian tube. For example, in mammals, the newly fertilized cell is called a zygote. The zygote will pass through the fallopian tube going into the uterus. The zygote then sets into the uterus lining to support its embryo development.
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