1. When we go up the altitude, beyond a particular height no trees are found and the vegetation comprises only of shrubs and herbs. The altitude beyond which no tree is seen is known as tree line.

    When we go up the altitude, beyond a particular height no trees are found and the vegetation comprises only of shrubs and herbs. The altitude beyond which no tree is seen is known as tree line.

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  2. Species extinction occuring at present is due to anthropogenic causes where as the earlier extinction was due to natural causes.

    Species extinction occuring at present is due to anthropogenic causes where as the earlier extinction was due to natural causes.

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