Which situation most clearly presents an example of Newton's third law of motion? A. When a car runs into a stop sign, the stop sign will get knocked down.
B. When a girl on roller skates throws a basketball forward, she will roll backwards.
C. When dropped to the floor, a basketball stops after four bounces.
D. The heavier a rolling cart is, the less it will roll when a person pushes it.

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter  

the correct answer to this question is 2

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally