The text says that in addition to the four social revolutions we have had, we may be entering a fifth prompted by .

Mapping the human genome and biotech

Explanation:

Social Change is simply defined as the act of alterating the culture and societies over the period of time.

The four social revolutions:

1. hunting and gathering societies developed into horticultural and pastoral societies.

2. the plow brought about agricultural societies

3. steam engine brought the industrial revolution

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