Question

1. why are there usually fewer organisms at the top of an energy pyramid?

Explanation:

Energy pyramids show energy transfer. Only about 10% of energy moves to next level. Top - level organisms need more energy. So, fewer can survive due to limited energy availability.

Answer:

There is less energy available at the top of the energy pyramid. Only about 10% of the energy is passed from one trophic level to the next. Top - level organisms (like apex predators) require a large amount of energy to survive. Since there is not enough energy to support a large number of them (because most energy is lost as heat or used for metabolism at lower levels), there are usually fewer organisms at the top.