Respuesta :
Answer:
Extreme Efforts.
Explanation:
When looking at, "...go to great lengths...", it can stress enough that there is a large effort to make sure these bees are protected from invaders.
Answer:
Extreme efforts.
Explanation: If someone goes to great lengths to do something, they are putting in a lot of effort. So, bee keepers put in extreme effort to protect bees from invaders.