In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Let me give you an example: A lion has _ legs.
The answer to this example can be: four
Here is why: The most logical numeric answer in words is four.

OK. solve this:
Some ticks feed on only one host throughout all _ life stages.
Answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
three