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Origin and growth of plants
Formation of new stars
Behaviour of animals
The forms of life as revealed by fossils of animals or plants
Paper is manufactured by
Paper of old books turns to brownish color due to
Paraffin wax used for making candles is obtained from
Particulates (< 1 µm size) remaining suspended in air indefinitely transported by wind currents are called
Pasteurisation is the process in which milk is heated to
Patients with sickle cell anemia are homozygous for
Pedology is the study of
People die in an atmosphere of carbon dioxide because
Percentage of carbon in steel ranges from
Percentage of lead in lead pencils is