internal rtilizatio11 Unlike aniong frogs, they also reproduce sexually but fertilization occurs in the water or outside the body. External fertilization happens when both male and female frog release sperm and egg, in the water to form fertilized eggs. This is the reason why the eggs of frogs are usually seen in the water. Learning Task 4: Think of two animals that reproduce sexually. In the first box, draw an animal that fertilization occurs inside the body. In the second box, draw an animal that exhibits external fertilization. 19 PIVOT 4A CALABARZON Science 05​