Explain the roles each kingdom plays in an ecosystem and its importance to the sustainability of that ecosystem.

1. Monera - includes bacteria that plays several roles like nitrogen fixation.

2. Protista - produce more oxygen as compared to all land plants put together.

3. Fungi  - fungi degrades organic matter and recycle nutrients in the ecosystem.

4. Plantae - plants carry out the process of photosynthesis and maintains the CO2 and O2 level of the atmosphere.

5. Animalia - animals play a key role in stabilizing the food chain of the ecosystem.

a car engine

Explanation: An open system is one in which both mass and energy can be exchanged with the surroundings.

A closed system is one in which only energy can be exchanged with the surroundings.

An isolated system is one in which neither mass nor energy can be exchanged with the surroundings.

A) an insulated gas cylinder is an example of isolated system.

C) Our universe is an example of closed system.

D) A greenhouse is an example of closed system.