Light does not travel at a constant speed in a vacuum, compared to in air, because the light is being absorbed by atoms and molecules in the air. But light does travel at a constant speed in a vacuum.
So I agree with A
All that talk about moving forward is irrelevant (I think)
Answer:It has the lowest effective nuclear charge of the four new elements.
Can you please give me more details so I can help you
It is a graph. It shows observations and then you record your results with any of the graph types.
