The answer would be 36, you just fill in what you know and solve the problem.
A body of permeable rock which can contain or transmit groundwater.
4,000 species can be found around the world
The answer is 300 joules of energy.
An energy pyramid is a presentation of the trophic levels in an ecosystem. Energy from the sun is transferred through the ecosystem by passing through various trophic levels. Roughly 10% of the energy is transferred from one trophic level to the next, thus preventing a large number of trophic levels.
