How do light microscopes differ from electron microscopes? )
A)
Light microscopes can be used to study cells; electron microscopes cannot.
Light microscopes can examine living specimens; electron microscopes
cannot.
B)
Electron microscopes can be used to examine living specimens; light
microscopes cannot.
Light microscopes can magnify a specimen up to 100,000 times; electron
microscopes magnify up to 1500 times.
D)

It is C.

Took bio last year!

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.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.