How does the law of conservation of energy apply to machines?

(a) machines create energy from scratch.
(b) machines consume energy until no energy remains.
(c) energy transferred to a machine equals energy transferred from it.
(d) engineers break the law of conservation of energy by using machines.

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