The sand because the body of water takes time to get warmer
Mitosis, as a cell gives two daughter cells with the number of chromosome in daughter cells remaining same as that of parent, hence also known as equational cell division.
I think I understand your question, but you question has so many errors in it that it doesn't really make sense.
The correct answer would be: dependence on nonrenewable resources.
A nonrenewable resources are resources that cannot be readily replaced by natural means, such as fossil fuels (oil, natural gas). The use of these resources is not sustainable because their formation takes billions of years. The whole world is dependent on these non-renewable sources but they are becoming more scarce daily.
I would say DNA needs to be in a double helix so it can be unraveled and duplicated during cell mitosis
