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Darwin and Natural Selection: The English naturalist Charles Darwin (1809-1882) explained how biological evolution took place, in his remarkable "The Origin of Species" in
Describe the formation of igneous and metamorphic rocks? Ans) Igneous rocks are formed by volcanic action and due to of volcanic activity. Metamorphic rock is formed by a co
To show the presence of nodules of nitrogen-fixing bacteria on the roots of legumes Carefully spade up some leguminous plant like as clover, alfalfa, soy-beans, cow peas, etc.
mode of nutrition in crow?
Question : a) Define i) relative humidity. b) Why is it generally cloudy in the vicinity of a low pressure area and sunny in the vicinity of high pressure? c) What are th
Define age related changes in Respiratory system During ageing, alveoli (present in the lungs) become flatter and shallower, alveolar ducts enlarge, walls become thinner, conta
Lowing soap bubbles with hydrogen Mix up a strong soap solution that will make good soap bubbles. Place a small funnel tube or a clay pipe on the delivery tube. When you have a
how does our lungs work
CHEMICAL HAZARDS : Chemicals are present in all laboratories. It is good to consider all chemicals toxic and flammable unless one has definite information regarding its nature. Ou
List any three human activities that you think would lead to air pollution. The following three human activities would lead to air pollution: (i) Burning of fossil fuels such
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