a freshwater lake in the mountains marine fossils in a freshwater lake saltwater clams in the ocean a sandy beach next to the ocean
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of these provides the best evidence that an environmental change has occurred?
Possibilities:
- a freshwater lake in the mountains
- marine fossils in a freshwater lake
- saltwater clams in the ocean
- a sandy beach next to the ocean

marine fossils in a freshwater lake