Answer:
A.
Explanation:
Duncan James Watts is a sociologist that was born on February 20, 1971 in Guelph, Canada and became principal researcher at Microsoft Research. To investigate how some pop songs become hits, Watts manipulated songs' ratings and download numbers to observe the effects on songs' popularity. By doing so he analyzed if the manipulated ratings caused the songs popularity to go up or down.
Answer:
Color Vision may have evolved for the express purpose of detecting fruit.
Explanation:
On picking strawberries we are easily able to detect green foliage from the ripe red berries ,the green blossoms and the white, still forming berries.This ld to the suggestion that our color vision may have evolved over the years to differentiate between the fruits.
His invention of air brakes made railroad travel safer and faster.
Answer:
a balance achieved between two desirable but incompatible features; a compromise.
Explanation:
