Environmental Science
Most harmful environmental pollutants are

natural nutrients in excess
human organic wastes
non-biodegradable chemicals
waste animal feed

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

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