Answer:
B. Natural Selection, others are some what related to genetic engineering.
Answer:
D Flu is caused by a virus.
Explanation:
Antibiotics are designed for bacteria, not viruses.
More advanced than tools used on earth
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.
lots of waste and dead leaves and things like that
dont plagarise ;)
