Anew energy source found in the ocean that is currently very costly to obtain

The correct answer is methane hydrates.

Explanation:

Huge concentrations of methane hydrate have been discovered underneath the Arctic permafrost, in the sedimentary deposits along the continental margins all over the world, and underneath the Antarctica ice. In some regions of the world, they are much closer to the regions of high-population in comparison to any natural gas field. These close deposits would permit the nations to import natural gas in order to become self-reliant. However, this new source of energy is very costly to obtain.

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.

the answer is "a.) well–developed vascular system."

explanation: