The classification system for organisms has changed from seven levels to eight. this happened because
scientific consensus changed as scientists learned more about organisms.
scientists did not test the seven-level system often enough to lead to consensus.
the eight-level system of classification is an emerging idea that needs more testing.
the seven-level system of classification was not supported by scientists.

Option A

Explanation:

There was a need to increase the level of classification from seven to eight because scientist learned more about organism.

Earlier, the knowledge that was used to classify organism was limited upto 7 level which was fine until more organism was not studied by the scientists.

As more research lead to upgradation in the number of organism and their characters, then there was a need of one more level of classification.

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