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Class-6
Subject- Science ​

Answer 1

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2 78% nitrogen 21% Oxygen remain carbon dioxide and other gases.

5 wind is important for the sailling a boat because the cloth which is fixed with the boat depends upon the wind to move forward or in different directions. 6aquatic plants and animal breath with the dissolved oxygen in the water plants is usually have their stomata and chlorophyll and leaves to to breath and aquatic animals has the fins and different features to breathe to separate the water from oxygen