What Do Redwoods, Humans, and Bacteria Have in Common?

What do elephants, humans, and bacteria have in common? Probably a lot, but the answer I’m looking for is the amount of energy we use. Scientists have found that all living things use roughly the same amount of energy. It seems this study contradicts earlier research. I’m interested to find out more, especially after reporting on Tardigrade that can survive all kinds of crazy conditions. Even humans seem to burn different amount of energy (think of the skinny guy who can eat anything), although I doubt that’s an order of magnitude different among species.