Which best supports the evidence that an asteroid collision may have caused caused the extinction of dinosaurs A. Dinosaur fossil remains are found at the bottom of a body of water.
B. Bodies of dinosaurs are only found in craters where asteroid collided.
C. Many dinosaur skeletons are found in one particular rock layer.
D. Rare metal on Earth called Iridium is found in layers where dinosaurs disappeared.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.