I would say C. Reduce climate change because taking a car/vehicle results in the earth becoming polluted which leads to climate change.
*EXPLANATION*
Riding your bike or walking will not do anything to help people chopping down trees, people giving birth to more and more children nor will increase the amount of animals/organisms we have on our planet.
I think but I do not know it refered to as being repetitive
True, reddish-yellowish color on pH paper shows acidity
Answer:
New moon, first quarter, full moon, and last quarter.
