Need help on this!! Will mark brainlist!

How do you name a compound with more than two elements?

Microorganisms aren’t all decomposers; in fact, many act as producers or primary consumers in an ecosystem. how do microorganisms that act as producers benefit the rest of an ecosystem in terms of energy transfer? what about microorganisms that act as primary consumers?

Which element provides strength to the exoskeleton of clams and oysters