A place where animals are protected in their natural habitat is called ________________.
Species found only in a particular area is known as____________.
Migratory birds fly to far away places because of __________ changes.
Differentiate between the following :Wildlife sanctuary and biosphere reserve.
Differentiate between the following :Zoo and wildlife sanctuary.
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Top layers of soil is fertile if it is exposed, soil erosion may take place. The soil may lose its fertility and humus. And gradually may lead to the conversion of fertile land to deserts.