A closed system is a system that makes no physical or chemical exchanges with its environment. Of these systems provided as choices (tree, human, clock, car), only a clock does not make exchanges with the environment, except for energy.
Therefore, of that list, only a clock would be a closed system.
Hope that helped! =)
Answer:
kilogram - measurement of mass
Explanation:
That's the correct answer
Kelvin for measurement of heat
Ampere for measurement of the power of electricity
Answer:
c.assembling parts of the virus
A crevice is a narrow opening resulting from a split or a crack. <span />
