Which of the following is the best definition of an ecosystem? All the biotic and abiotic things located in a space no smaller than a forest
All the biotic things located within a particular space
All the biotic things located in space the size of a forest
All the biotic and abiotic things located within a particular area

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.