1. Phytoplankton:- Microscopic organism which passively float on the surface of water.
2. Parasites:- Organism which depends on the other living organisms for their food and shelter.
3. Poikilothermic:- Organism which change their body temperature according to surrounding. These are also called cold blooded animals.
4. Pigment:- A substance which absorb light of certain wavelength like chlorophyll found in green leaves.
5. Paleontology:- Study of fossils.
6. Physiology:- Study of function of various system of organism.
7. Pathology:- Study of diseases, effects,causable agents and transmission of pathogens.
8. Pomology:- Study of fruit and fruit yielding plants.
9. Psychiatry:- Treatment of mental disorders.
10. Psychology:- Study of human mind and behaviour.
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