Why do different tropic levels have different amounts of energy?

What are some possible short and long term medical concerns for crew members on longer space exploration trips

Actinobacteria sp. are fermenting organisms (which do you use oxygen to breathe) referred to as chemoorganohetereotrophs this means they break down organic material and convert it to inorganic material. which part of the carbon cycle does this describe

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity