The corner of the cells of collenchyma tissue in plants are thickened due to dipostion of : a) Lignin and Suberin
b) Suberi and Cutin
c) Cellulose and Pectin
d) Chitin and Lignin

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all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.