Which is the dark reaction called a cycle

Which kingdom includes some organisms that have no nucleus and can live in an environment with an extremely high salt content

How does the carbon cycle involve an exchange of carbon

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid