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Wetlands - Lentic Ecosystems
Wetlands are permanently or periodically water covered areas. They can be defined as submerged or saturated lands either artificially or naturally, and either periodically or permanently up to a depth of six metres by water which may be fresh brackish or saline.
These wetlands may be classified into two categories Inland wetlands which occur inland and contain fresh water e.g. bogs, swamps, etc. Coastal wetlands which occur near the coast and contain saline or brackish waters, e.g. mangrove swamps, mangrove forests.
Origin and Evolution of Metazoa Most of the early metazoans were soft bodied and so their fossils are rare. The extremely fragmented fossil record does not shed any specific l
#question.why obelia is considered of special interest in zoology.
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Aneuploidy : One or inore chron~osomes of a normal set nlay bc lacking or present in excess. The term riullison~y refers to absence of both the chromosomes of a pair. Monosomy, tri
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