It means, for example if I say, "I go to the park every now and then", then it isn't a common event, but happens often enough not to be classified as a rarity.
Answer: what is the question
Explanation:
Well if we are careless and we pollute the earth it will slowly become un usuable but if we are careful and recycle then the resources that we have would last longer
For number 2. It’s C I believe