AP PSYCHOLOGY

Detailed explanation-1: -Most aquatic organisms that reproduce sexually use this method of fertilization. Because it happens outside of the body, we call this “external fertilization”. External fertilization in animals usually occurs in water or in damp areas in a process called spawning.

Detailed explanation-2: -External Fertilization After the sperm reaches the egg, fertilization takes place. Most external fertilization happens during the process of spawning where one or several females release their eggs and the male(s) release sperm in the same area, at the same time.

Detailed explanation-3: -During fertilization, the sperm and egg unite in one of the fallopian tubes to form a zygote. Then the zygote travels down the fallopian tube, where it becomes a morula. Once it reaches the uterus, the morula becomes a blastocyst.

Detailed explanation-4: -External fertilization is characterized by the release of both sperm and eggs into an external environment; sperm will fertilize the egg outside of the organism, as seen in spawning.