What defines radial symmetry?
a) Any plane of symmetry passing through the center of the organism splits it into equal halves.
b) Only five planes of symmetry passing through the center of the organism splits it into equal halves.
c) Only one plane of symmetry splits the organism into equal halves.
d) No planes of symmetry exist; the organism cannot be split into equal halves.

A

Explanation:

symmetry about a central axis, as in a starfish or a tulip flower

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.