The hot, expanding gases generated by the combustion reaction in the engines are:
O A. released through the back of the engine to propel it and the
airplane forward.
B. used to move the wings.
c. used to provide lift for the airplane.
D. used to move the lytons, which help to propel the airplane.
SUBMI

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.

answer: they produce more slow than unicellular organisms.