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.
Uracil......... Is the answer i could find.
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Answer:
In a comparison of birds and mammals, the condition of having four limbs is a shared ancestral character
