Concept:External fertilization occurs when sperm meets the egg outside the female's body.
It is common in aquatic animals, especially amphibians.
Explanation:The toad is an amphibian.
Amphibians like toads release eggs and sperm into water.
Fertilization then happens outside the female's body.
Lizards, birds, and cockroaches reproduce by internal fertilization.
Their sperm fertilizes eggs inside the female's body.
Therefore, external fertilization takes place in the toad.
Answer:A. toad