What is the source of energy for most communities of living organisms?

What do green plants and algae absorb?

Which energy transfers occur during photosynthesis? Where is this energy stored?

Why is the mass of living material (biomass) at each stage in a food chain less that it was at the previous stage?

How can the biomass at each stage be drawn to scale?

How can the efficiency of food production be improved?

Are fish stocks in oceans rising or declining?

Why is it important to maintain fish stocks at a level where breeding continues?

What two things play important roles in the conservation of fish stocks?