The average life span of humans in between 1700-1850 was around 55.
but because of chemicals and various improvement in technology the life span of humans today is nearly 72.
chemicals are used in various industries.
the hair dye which many people apply contains of chemical
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The average life span of humans in between 1700-1850 was around 55.
but because of chemicals and various improvement in technology the life span of humans today is nearly 72.
chemicals are used in various industries.
the hair dye which many people apply contains of chemical