African infants have had a greater chance of survival if they have a living maternal grandmother who is without young children of her own. this fact has been used to support an evolutionary explanation of:

Grandmother hypothesis

Explanation:

Grandmother hypothesis states that a woman with a living grandmother in close proximity will tend to have more children and mortality of the children will be reduced because of the help that will be rendered by the grandmother.

A Simon Chapman, a student at the University of Turku in Finland also supports this hypothesis, He reported that having a grandmother age 50 to 75 increased a toddler's chance of surviving from age 2 to 5 by 30 percent.

answer; migrate from a region;

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