Question

29 ecological pyramids are a good model to use to show the relationships between trophic levels in an ecosystem because
a it shows that the lower levels are needed to support the higher levels
b it shows that the higher levels do not need any support from the lower levels
c it shows that the higher levels are bigger than the lower levels
d they are exact

Explanation:

In an ecosystem, trophic levels (like producers, primary consumers, etc.) have a relationship where lower levels (e.g., producers) provide energy and biomass to support higher levels (e.g., consumers). Ecological pyramids represent this: the base (lower level) is wider, providing support for the smaller upper levels. Option B is wrong because higher levels do need lower - level support. Option C is wrong as higher trophic levels have less biomass/energy (so are smaller, not bigger). Option D is wrong as ecological pyramids are models, not exact representations of all aspects. So the correct option is A.

Answer:

A. it shows that the lower levels are needed to support the higher levels