21. What does “opt out” mean with regards to Europe’s organ donation policy? A) They do not have permission to take your organs at any time.
B) You can sign up to donate at any time.
C) They take your organs unless someone says no at the time.
D) They take your organs only if you agree at the time.

one centimetre is equal to 0.01 metres

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: