The answer is either
b A system in which Newton's Laws are valid
or
c A system in which there are no external forces.
Explanation:
not a, and not d
There are energy changes in a closed system.
A closed system obeys the conservation laws in its physical description.
The first one It sends signals that control heart rate and respiration. I hope this helps :)
Answer: Electromagnetic waves are generated by moving electrons. An electron generates an electric field which we can visualize as lines radiating from the electron Figure 10a. If the electron moves, say it vibrates back and forth, then this motion will be transferred to the field lines and they will become wavy Figure 10b.
Cells undergo cell division ( creates more cells to replace dead cells )
Answer:
false
Explanation:
sound travels slower than light. that is why we see lightning before we hear the thunder
