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unicellular organisms that contain a true nucleus and membrane bound organelles. All protists are aquatic.
the seepage of acidic, contaminated water from disused mines and mine dumps.
endocrine gland situated on top of each kidney, which produces hormones in response to stresses...
substances that have a harmful effect on the environment and also on human health.
minute pores in the epidermis of a leaf or stem which allows for movement of gases and water...