rashmi and rekha are doing a research on the people worling with coal tar . according to the report prepared by them, people who work under prolonged exposure to coal tar suffer frok skin cancer and ask the authorities to vacant the factories. a) what is the reason behind the people getting infected with skin cancer? b) what values are associated with it?
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Answer:
In plants body basic structure is a major criteria based on which Thallophytes are different from Bryophytes. Apart from this absence or presence of seeds is another important criteria. Gymnosperms and angiosperms are further segregated based on if seeds are covered or not. It is clear that it is the morphological character which makes the basis for classification of plants.
In animals classification is based on more minute structural variations. So in place of morphology, cytology forms the basis. Animals are classified based on layers of cells, presence or absence of coelom. Further higher the hierarchy animals are classified based on presence or absence of smaller features, like presence or absence of four legs.
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