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Gaurav Seth 6 years, 11 months ago
(a) Impressions of the body parts of the organisms and preserved traces of the living organisms are called fossils.
(b) The presence of fossilized remains of the organism is the evidence of existence of organisms million years ago which have now become extinct. Fossils also help in determining the connecting links between various groups and their origin from their primitive ones
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Yogita Ingle 6 years, 11 months ago
- Fossils are preserved remains of living organisms from remote past.
- Fossil mainly preserves only a portion of the dead organism (eg: skeleton, bone, teeth etc..)
- Fossils may vary from microscopic (single bacterial cell) to dinosaurs.
- Layers of fossils are formed one after another over years. Deeper the layer where the fossil is found, older it is.
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Yogita Ingle 6 years, 11 months ago
Acids are chemical substances which readily produce H⁺ ions when dissolved in aqueous solutions and are corrosive or sour when tasted and can neutralize alkalis and turns blue litmus to red colour
For Ex: The sour taste of lemon is due to the citric acid present in it.Fruits,curd are sour due to the presence of acids.
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Aaisha ?????????? 6 years, 9 months ago
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