External fertilization involves releasing sperm and eggs into the external environment, common in many fish and amphibians, exposing the eggs to environmental risks.
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. Examples include many fish species like salmon or frogs that lay eggs in water for fertilization to occur externally. This method exposes the eggs to various environmental risks.
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