Answer:
As they produce food by the process of photosynthesis which cannot be done by anyone else. Plants use chlorophyll, CO2 and H2O in photosynthesis( which is a biochemical process). Plants became a cause of life on earth. Hence plants are the ultimate source of food on earth.
The westerlies wind from Mediterranean sea cause the more rainfall in winter in western part so winter crpos grow well in western part of nepal.
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The dialysis bag will remain the same size in a isotonic solution.
