Answer:
A.The hole in the ozone layer
Explanation:
• Montreal protocol is an international treaty that was signed to control the use of substances that are resulting in the depletion of the ozone hole.
This treaty was signed in the year 1987 and became effective form 1989.
• Since the time that this treaty has come into force, there has been a significant improvement in the ozone hole that was observed over Antarctic as it's size has decreased.
• This improvement has been possible because the treaty helped to phase out chemicals such as chlorofluorocarbons, carbon tetrachloride, etc. that are responsible for ozone hole depletion.
Answer: Natural variation.
Carbon dioxide and water are components of air help to trap infrared energy.
Explanation:
The atmosphere of the planet acts in a {very} very similar thanks to a greenhouse. daylight penetrates the clear air and causes the bottom to heat.
The atmosphere then acts as a blanket, keeping the heat of the planet from escaping back to the area. This result is thanks to bound gases within the atmosphere that are superb at gripping and re-radiating the warmth energy before it's lost to the area.
These gases, referred to as "greenhouse gases", embrace greenhouse emission, water vapor, and paraffin.
Answer:
The theory of evolution basically serves to explain the biological evolution of living beings. The theory of evolution basically serves to explain the biological evolution of living beings. This results in the appearance of new species different from the previous ones.
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