Learning map Rich and Poor / Resume: Rich and Poor Rich and Poor
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Question 4
1
The extreme variation in life expectancy over the world can be due to access to
ple
wealth
vaccinations
entertainment
human relationships
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distance, luminosity, brightness, radius, chemical composition, and temperature

the answer is 1 i believe

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.