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Digestive Tract
Extracellular digestion takes place in a tubular cavity that extends throughout the length of the organism. All animals after flatworms have-a tubular alimentary organisation open at both ends. The development of extracellular digestion freed many animals from feeding continuously on small particles. They could now quickly ingest a few large chunks of food. The overall tubular organisation of the digestive tract also allows the food to travel in one direction passing through regions of digestive specialisation.
Figure: Generalised digestive tract. One way passage of food allows sequential stages in digestion. Dashed lines represent crop in some animals
HARD Y - WEINBERG LAW - Proposed by G.H. Hardy and W. Weinberg in 1908 independently. The law states "the frequency of genes or alleles in a population remains constant
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