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.
Not to be concerned as long as the diet as a whole provides average amounts
Batesian mimicry is when an organism uses colors or symbols that other organisms regard as dangerous. These organisms use their scary appearance to appear as more of a threat than they really are, such as the viceroy butterfly, which looks like a poisonous monarch but is actually harmless.
Answer:
their nuclear material is naked not membrane bound
Answer:
the fine transparent tubular sheath which envelops the fibres of skeletal muscles.
