The right option is A. hydrofluorocarbons
Hydrofluorocarbons are pollutants that are likely to be produced from air conditioning.
Hydrofluorocarbons (HFCs) are synthetic fluorinated strong greenhouse gases that are strongly accumulating in the atmosphere. Hydrofluorocarbons are mainly used as refrigerants. Hydrofluorocarbons are used to replace ozone depleting substances such as chlorofluorocarbons and hydrochlorofluorocarbons which are being phased out in air conditioning, refrigeration, foam blowing agents, and solvents. Hydrofluorocarbons are responsible for about 20% of climate pollution by 2050
<span>b. a cell takes in DNA from outside the cell.</span>
I can say for certain that it's really probably not A. or D.
As for B. or C., I'd say C.
Answer:
hey friend..... here is your answer....
the shape of DNA is double helix
Answer:
Oxygen and Carbon dioxide