Environmental Science
The main reason(s) for warm summers in northern middle latitudes is that:

The sun is higher in the sky and we receive more direct solar radiation
All of these
Only (b) and (c) are correct
The earth is closer to the sun in summer
The days are longer

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Environmental Science
Which of the following regarding ecological pyramids is not correct?

In most ecosystems, the pyramid of numbers and biomass are up right
In deep water ecosystem, the pyramid of biomass is upright
The pyramid of energy expresses mainly the rate of food production
In tree dominated ecosystem the pyramid of numbers is inverted
The total energy flow at successive tropical level always decreases

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