An example of a secondary source is
a. a textbook.
b. a diary.
c. a poem
d. an interview.

Explanation:

Yes i did look it up had to bc of the person above i as trying to make sure it was right

from the original order (top to bottom) the new order will go

1 (founder)

4 (hawk)

2 (mutate)

3 (next generation)

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.