Answer:
Grid
Explanation:
The number of electrons attaining the fluorescent light is regulated by the grid in a cathode ray tube.When the heater is supplied with current, it allows the electrons to emit from the cathode. Before approaching the anode the electrons pass through grid opening. The number of electrons attempting to reach the anode may also be regulated by managing the number of electrons passing through the grid.
The lower layer is thought to be hard and rough
I'm sorry if this is wrong but I think it's 2.5 net
Hypothesis
A scientific hypothesis must be testable and capable of being proven false.