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the growth of cities due to the influx of people from rural areas.
blood vessels that transport deoxygenated blood from the heart to the lungs.
extremely small infectious particles that can only reproduce inside a host cell.
small, non-pigmented plastids that occur in roots and non-photosynthetic tissues of plants. They...
(also called homeostatic control) the self-regulation and maintenance of a constant stable...
coiled thread-like structures of DNA and histone, which is a protein, in the cell nucleus. They...