Infancy group of answer choices is also called the "neonatal period."

a. runs from three to seven years, generally postweaning.
b. includes three months before birth and three months after birth.
c. runs from the second month after birth to the end of lactation,
d. usually by the end of the third year.

The answer is B

Explanation:

The infancy group which includes the neonatal period ranges from three months before birth till three months after birth. The first is called the perinatal period. From birth till the first month it is called the neonatal period, and from the first till the third month is a section of the infancy period.

a. formula: f=ma or f/m=a

10,000n/1,267kg≈7.9m/

b. formula: a= and s=d/t

speed= 394.6/15

s=26.3m/s

a=

a=1.75m/

c. 7.9-1.75=difference of 6.15m/

d. the force that most likely caused this difference is friction forces