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.
The purpose of a lysosome is to digest things inside of a cell. Acting like "the stomach" of a cell, lysosomes are only found inside of animal cells, not plant cells. The lysosome holds enzymes created by the cell so it is able to digest things.
A foot consists of twelve inches. Five feet times twelve= sixty inches.
