Because vegetarians don't drive alot.
Because less people are needed to eat plants.
Because more people can be fed with the same amount of energy.
Wind and temperature
Food and temperature
Wind and availability of water
Sunlight and availability of water
Nasty little buggers!
Its role in the ecosystem
Its role in the ecosystem and its location
None of the above
Energy is lost according to the first law of thermodynamics
You move further away from the autotrophs
There is a decrease in biomass
All of the above
Here's an interesting quiz for you.