D oxygen i believe is your answer
B.. It can easily be transformed from high voltages to low voltages.
Answer:
The change in angular momentum is 
Explanation:
From the question we are told that
The initial angular velocity of the spinning top is 
The angular velocity after it slow down is 
The time for it to slow down is 
The rotational inertia due to friction is 
Generally the change in the angular momentum is mathematically represented as

substituting values


Answer:it has risen
Explanation:
It has risen due to the burning of fossil fuels which produces a lot of green house gases.and it has also risen due to deforestation,no enough plants to consume the green house gas(carbon dioxide)