Which are characteristics of mammals? Check all that apply. internal fertilization
three-chambered heart
endothermic
highly developed nervous system
several nearly hollow bones
always live on land

several hollow bones,endothermic

Explanation:

i was looking for the same answer but i can't get one eather

Explanation:

sure what is it? ^w^

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.