Answer:
The Six Kingdoms. When Linnaeus developed his system of classification, there were only two kingdoms, Plants and Animals. But the use of the microscope led to the discovery of new organisms and the identification of differences in cells. Today the system of classification includes six kingdoms.
Explanation:
The answer is d. Source water are River, streams, lake etc that provide drinking water
The smallest group of organisms in which evolution can take place is Species.
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