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Biochemical Evidence: As we had said earlier in section 13.2, Darwin had recognized that humans and the great apes shared many physical characteristics. This led him to co
Explain Nervous Phase of Pancreatic Secretion Nervous phase: When stomach secretes gastric juice in cephalic phase and gastric phase, nerve impulses are simultaneously transmit
Q.Name two biologically important compounds that contain both oxygen and nitrogen. Two biologically important compounds that contain both oxygen and nitrogen are: (i) Amino a
What causes winds? An uneven heating of the Earth's surface causes winds. On being heated, air becomes lighter and rises up. As a result, a region of low pressure is created. Th
Radiation: High doses of radiation are very harmful for human health. Do you know about the disaster ceated by the first atomic bombs which were exploded on two cities of Japa
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Solid waste Solid waste in some cases can be a resource. A good example is the factory at Yokohama in Japan which is engaged in converting waste paper into toilet paper. In our
How to prepare hydrogen Hydrogen can be prepared from a dilute acid, like as hydrochloric or sulphuric, when it is chemically reacted with a metal like as zinc. The acid may be
The effect of soap on surface tension Select a large plate and rinse it unless you are sure that it is very clean. Fill the plate with cold water and let it stand for a time on
Origin of life on the earth: Man has always wondered how he came into existence, who created him, and why he was created. Curiosity in this connection has been so strong that
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