Answer:
Conservation efforts have had a positive impact on ecosystems that have been previously harmed due to human activity. Conservation efforts have helped preserve and even restore habitats that had been damaged or threatened by human activity. They have also helped protect endangered species.
C) Is the correct answer I believe, unless you want to flush the chemicals down the sink and then have a reaction with them the next time you go swimming in a lake and find them there.
Жила была царевна но туда ей бросил лёд
