Answer:

Hi dear

Explanation:

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.

Answer:

Historical changes brought about in the secondary sector are the following :

(i)Over a long time and especially because new methods of manufacturing were introduced, factories came up and started improving. (ii)Those people who had earlier worked on farms now began to work in factories in large quantities.

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