One example of a changing biotic factor in an ecosystem would be a) the seasonal migration of birds. b) the seasonal changes in temperature. c) an increase in sunlight during the summer. d) an increase in rainfall during the spring.

c

explanation:

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.