Final answer:
Sea turtles are under scientific investigation for multiple reasons including protection from man-made threats, understanding their reproductive cycle, and government protection.
Step-by-step explanation:
The passage mentions several reasons why sea turtles are under scientific investigation. First, communities have worked to protect loggerheads from man-made threats, such as habitat loss and over-hunting. Second, scientists need to understand the reproductive cycle of the loggerhead turtles. Third, the passage indicates that these turtles are protected by the government to some extent.