Question

4 what is the “conservation mystery” that scientists are trying to solve using tiny tracking devices called nanotags? 5 why are scientists hoping to learn more about what happens to sandpipers while they winter in northern south america?

Explanation:

Without additional context, it's impossible to determine the "conservation mystery" for question 4. For question 5, understanding sandpiper behavior during winter - such as threats to their survival, habitat - use, and migration - related information - can aid in conservation efforts.

Answer:

1. No answer due to lack of context.
2. To aid in conservation efforts by understanding threats, habitat - use, and migration - related information.