Ecosystems Help?

Question

I need some help with a couple of questions regarding ecosystems:

1. what problem might you encounter if you tried to show energy flow through an ecosystem using a pyramid of numbers?

2. How might a pyramid of energy for a grassland community differ from summer to winter? Guess the effects of the differing abiotic conditions.

3. Why is a pyramid of numbers different looking than a pyramid of biomass?

Answer 1

1) a number on the bottom that would be decreased by 90% per trophic level on its way up to the top of the pyramid.

2) That should be obvious. No grass biomass in the winter to feed herbivores, for instance.

3) Got me? See 1.