Why are there no gram positive archae species but there are gram positive bacteria species?

Which statements are true of a scientific theory but not a hypothesis

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?

Long term exposure to waves can cause sunburns and skin cancer.