Using what you already know and context clues from the McCulloch excerpt, what two (2) fundamental constitutional questions were answered in this landmark case?

c. plumb line

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.