Pyramid of numbers is :
1. Always upright
2. Always inverted
3. Either upright or inverted
4. Neither upright nor inverted

Subtopic:  Ecological Pyramids |
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The ecological pyramids that can never be inverted in a natural ecosystem include:

I:  pyramid of numbers
II:  pyramid of energy in any ecosystem
III:  pyramid of biomass in the sea

1. Only II
2. Only III
3. Only II and III
4. All can be inverted

Subtopic:  Ecological Pyramids |
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In an open ocean, the pyramid of biomass is often inverted. How can this support higher trophic levels?

1.  The food produced by primary producers is of high quality
2.  The primary producers grow and reproduce at high rates
3.  Primary producers are very abundant.
4.  The predators at higher trophic levels are very efficient
Subtopic:  Ecological Pyramids |
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