Explain ONE continuity in European society from around 1750 - 1900 CE.

The era from 1450 CE to 1900 CE encompasses two periods in history. The early modern period between 1450 and 1750 CE is characterized by the age of commercial revolution and the beginning of European dominance. The second period between 1750 and 1900 CE represents an era of Atlantic and Industrial Revolutions as well as the Age of Imperialism.

Explanation:

the correct answer is moro reflex. this is usually witnessed in infants normally up to the age of 4-5 months (in some cases maybe more)  

it is caused by a sudden loss of support that makes the baby feel as if he or she is falling or is going to fall and hence the flinging of the arms and crying.