Answer:
The sentence that is not true about the two passages is Both authors state that coral reefs are polluting the ocean floor.
Step-by-step explanation:
The sentence that states that the coral reefs are polluting the ocean floor is far away from the concept of coral reef that is presented in the two passages as the authors have the intention of making people aware of the importance of coral reef in favor of keeping the marine life and its balance and how it is important to protect them since they are in danger.