Part A: Describe a situation where human intervention (intentional or unintentional activities) has significantly altered the coral reef ecosystem...

Part A:

Describe a situation where human intervention (intentional or unintentional activities) has significantly altered the coral reef ecosystem (either for the better or for the worst).

Part B:

Describe the coral reef ecosystem both before and after the changes and explain the factors that have caused the transformation (e.g. logging companies clearing large areas of forest or the introduction of a treatment plant that reduced the amount of raw sewage piped into the sea).