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Q. Can the amount of available energy in a given trophic level be larger than the available energy in inferior trophic levels? What does that condition means to the conformation of the energy pyramids?
The superior trophic level always has less available energy than inferior trophic levels. This is for the reason that in each trophic level only a fraction of the organic material of the level below is incorporated into the consumers (into their bodies) and the other part is eliminated as waste or is used in the metabolism as energy source. Thus it is never possible to have energy pyramids with reversed conformation that is with the tip to the bottom and the base to the top. It is also not possible to have superior trophic levels with a variable dimension larger than inferior ones. In the each energy pyramid, from the base to the top, the size of the variable dimension decreases.
Gastrulation The end of cleavage of the unicellular zygote results in the creation of multicellular blastula, which may be a solid structure with no a cavity (stereoblastula)
distinguishing characteristics of phylum platyhelminthes?
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Why acquired traits are not directly related to the process of evolution? As acquired traits are not genetically determined, they cannot be passed on to offspring. Therefore,
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What is digestion? Digestion is the breaking down of larger organic molecules obtained from the diet, e.g. carbohydrates, fats, proteins, into smaller ones, as glucose, fatty a
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Q. Into which classes is the phylum Annelida divided? The phylum is divided into three classes: hirudineans (e.g., leeches), oligochaetes (for example, earthworms) and polychae
COMMUNITY If you look around yourself you will notice that populations of plants and animals seldom occur by themselves. The reason for this is quite obvious. In order to survive
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