(a) Why do we classify elements?
(b) What are the two criteria used in the development of Modern Periodic Table?
(c) What is meant by periodicity in properties of elements with reference to the periodic table?
4. Give reasons for the following:
(a) Arteries are thick walled.
(b) Blood goes only once in one cycle through the heart in fishes.
(c) Plants have low energy needs.
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a) Classification is important because it allows scientists to identify, group, and properly name organisms via a standardized system .
4 (a)Blood is pumped into the arteries with a lot of pressure and the thickness helps the arteries to sustain such pressure.
4(c)Plants do not move. In a large plant body there are many dead cells like schlerenchyma as a result it requires less energy
4 (a)Blood is pumped into the arteries with a lot of pressure and the thickness helps the arteries to sustain such pressure.
4(c)Plants do not move. In a large plant body there are many dead cells like schlerenchyma as a result it requires less energy
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