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4 answers

there is nothing complicated about this:

it is very much like foodchain

the base of pyramid - plants that produce organic matter by photosynthesis. then herbivors. then carnivores. then larger carnivores make the top.

the point is that if things are to function in the long term, the pyramid must be pyramid-shape. that is more food than its eaters -at all levels. of course that one animal can feed on different levels of the pyramid, as it choses -veggies and meat. but the principle is that say in a forest, there is many times more biomass of vegetation than of animals. otherwise they would eat the place bare and then starve themselves. then we must have less birds of prey (in mass) than small rodents and birds - for the same reason.

the other extreme is bad too - if one level is missing - like if we kill too much animals on one level of pyramid, then we have overpopulation of what their feed on, say some smaller animals. they use up their food sources and starve and die off. therefore the populations of the bigger as well as smaller animals are difficult to reestablish.

so you see it is all about proportion between eaters and their food AND their eaters. so it is just like foodchain, only supplemented with quantitative information

2006-08-18 01:57:47 · answer #1 · answered by iva 4 · 0 0

Ecological pyramids are graphical representations of the number of individuals in different nutritional levels and..........

Ah it's old useless crap anyway.

2006-08-17 14:56:38 · answer #2 · answered by Hathor 4 · 0 0

Some make ALL the money (at the top)
the rest make nothing (at the bottom)

2006-08-17 14:52:03 · answer #3 · answered by pinkstealth 6 · 0 0

it is something related to the environment & its levels.
samajh gaye.

2006-08-17 18:30:15 · answer #4 · answered by Anonymous · 0 0

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