Flow of energy through living organisms

Misr

Hi there ,

[quote name = "An extract from my book"]

The pyramid of mass
Represents the relation between the masses of living organisms if food chain

Disadvantages :
It does not take in to consideration amount of food during a long period of time.

so my problem is that line :

"Disadvantages :
It does not take in to consideration amount of food during a long period of time."

Can u rephrase this in a better way and explain it to me??

Also

The pyramid of energy:
has no disadvantages as it considers the rate of food production and its total weight.

so , why??

Thanks very much

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