1. The digestive system relies on the system to deliver the nutrients to the entire body of the organism.
2. The respiratory system provides oxygen to the system.
3. Carbon dioxide from cells is delivered from the circulatory system back to
the system so it can exit the body.
4. The circulatory system carries the waste from throughout the organism to
the
system, which takes care of excreting the waste
from the organism.
5. The circulatory system and the
system interact to deliver
oxygen to and to remove carbon dioxide from cells.
6. The nervous and the
systems react to coordinate movement

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.

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.