The answer is The levels of G1 cyclins are too low.
I'm pretty sure it's letter A or C
Answer: Cardiorespiratory fitness
Explanation: Cardiorespiratory fitness is the term used to describe a person's ability to perform large muscle whole body exercise or physical activity of moderate to high intensity over a relatively long period of time. It is also the body's ability to supply enough oxygen to sustain long time whole body exercise.
It helps to ensure healthy living,by regulating blood pressure,weight,lowers blood sugar levels,ensures good and adequate sleep and controls asthma symptoms.
I don’t know just need points
