An energy pyramid is always related to the organisms food web. A increase in no of tropic levels could make it complex. Also the reason for only 4 or 5 is to make it simple to understand.
Plants show immediate growth, animals do not at first. The cells of plants differ immediately, whereas this is not the case with animals. Animals bend inwards and make a body cavity and plants do not form an inner space.
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This is very vague. I am pretty sure that there are other instructions.
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Common characteristics of birds and fishes are:
They can have Respiration.
They can move from one place to another.
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mendel and darwin!! hope this helps!!
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