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Darwin while evolving the concept of natural selection laid emphasis on competition among individuals belonging to a species, that is intraspecific competition. Here the individuals compete for almost identical requirements from the environment. Competition between individuals belonging to different species, that is interspecific competition is also observed in nature. In the following subsection we shall discuss the essential differences between the two types of competition, and subsequently highlight the role of natural selection in evolving coadapted colnmunities of closely related species.
TYPE S OF RIBOSOMES Ribosomes are of two types: - 1 . Procaryotic Ribosomes - 70 s = Occur in cytoplasm of prokaryotes, and also in mitochondria, and Chloroplast o
Solutes and ions tie up water in solution. Solutes lower aw and this reduction in aw depends on the total concentration of dissolved molecules and ions. Since these bind to water m
classification of excretory organs in helminthes, nermatodes, annelids, molluscs, arthropods and echinodems
In arthropods why isn't gas exchange done through cutaneous diffusion? In arthropods the impermeability of the exoskeleton makes the passage of gases complex. In addition the n
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What was Lamarck's explanation for the succession of fossils in a given location? ps: I want to the idea for the succession of fossils, not the whole difference between Darwin and
WHY OBELIA IS OF SPECIAL INTEREST IN ZOOLOGY
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