Final answer:
Tadpoles of spadefoot toads develop into the carnivorous morph when fed shrimp and other tadpoles, enabling them to move onto land. This morph provides an advantage in small pools by allowing them to catch and consume smaller prey.
Step-by-step explanation:
Tadpoles of spadefoot toads develop into the carnivorous morph when fed shrimp and other tadpoles. This is because the diet high in protein triggers the development of long, muscular legs, which enable them to move onto land.
The advantage of the carnivorous morph in small pools is that it allows the tadpoles to easily catch and consume smaller prey, such as insects, increasing their chances of survival and growth.