The best example of a 20th century relic wall is The great wall of china
The berlin wall
The Maginot Line
The Himalayan mountain range

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.

answer:

same bro same. its p*sses me offf