Here goes the question with no exact answer, lol <3
Scientists tell us that the observable universe is about 90 light years but then I wonder how they calculated that because the universe is immense!
I'm sorry but I can't go deeper into explaining as that's a tough question.
I think your answer is A not sure tho
Answer:
Elaina's scientific investigation is missing controlled variables.
Explanation:
A good scientific investigation should vary only the factor that is studied (the speed of the music. All other factors should be kept constant.
She hasn’t controlled for <em>volume</em>. The volume of the music may affect the rate at which the listener’s heart rate will increase. She should have measured each person’s pulse after the same period of listening.
She hasn’t controlled for <em>age</em>. A grandmother may respond to loud music differently from a teenager. All her subjects should be about the same age.
She hasn’t controlled for <em>wakefulness</em>. A person may respond to music differently when awake than when asleep.
Answer:
This question is incomplete
Explanation:
This question is incomplete, however it can be concluded that this question is testing concepts about equilibrium within a chemical reaction.
It is a rule that:
If a reactant is added, the forward reaction will be favored.
If a product is added, the reverse reaction will be favored.
The same principle can be applied if a reactant/product is taken away. The reaction will try and produce more of what is not there, and this will shift the equilibrium.
I think its B.} nobel gases
