A) major genetic changes that occurred over generations 70 through 80
b) minor genetic changes that occurred over generations 50 through 100
c) minor genetic changes that occurred 1 through 50
d) minor genetic changes that occurred 1 through 100

minor genetic changes that occurred over Generations 50 through 100.

Step-by-step explanation:

it was right on study island.

step-by-step explanation:

first, eliminate the parenthesis:

3

x

+

2

−

4

x

second, group like terms:

3

x

−

4

x

+

2

third, combine like terms:

(

3

−

4

)

x

+

2

→

−

1

x

+

2

→

−

x

+

2