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! =)
"A gas is cooling to its boiling point and becomes a liquid" is the answer.
Condensation is the process where a gas becomes a liquid, like after a hot shower, there is fog on your mirror that slowly turns into water droplets after you've turned off the water.
The largest mammal in the world would be
a Blue Whale... Hope this helps! :)
Answer:
B
Explanation:
Nerve cells can carry signals and connect all parts of the body to the brain
