Predation is referred to as a detrimental interaction. Explain any three positive roles, supported by an example each, that a predator plays in an ecosystem.

for example→ Grass → Goat → Lion / Lion (Predator) transfers the energy fixed by plants and the Ecosystem. e.g. Cactus feeding predator (moth) control the spreading of the prickly pear cactus. among competing prey species. e.g. extinction of more than $\displaystyle 10$ species of invertebrates due to removal of starfish Pisaster (predator)