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# Reproduction ## Fertilization * **External Fertilization**: * Eggs are fertilized outside the female (e.g., jellyfish, fish). * **Internal Fertilization**: * Eggs are fertilized within the female's body (e.g., insects, reptiles, birds). ## Conditions for External Fertilization 1. The...

# Reproduction ## Fertilization * **External Fertilization**: * Eggs are fertilized outside the female (e.g., jellyfish, fish). * **Internal Fertilization**: * Eggs are fertilized within the female's body (e.g., insects, reptiles, birds). ## Conditions for External Fertilization 1. The release of gametes must be properly timed. 2. Gametes must be protected. 3. The pathway must be protected. 4. Sperm can swim to the eggs, must be present. ## Internal Fertilization * **Estrous cycles**: Ensure that mating occurs when mature eggs are ready for fertilization. ## Types of Reproduction * **Viviparous**: Animals (like humans) that develop inside the mother's body. * **Ovoviviparous**: Animals (like snakes) where eggs remain in the mother until they are ready.