Improved posture is one of the benefits to having good balance.
Even though not many people pay attention to posture, it can be quite important. If you have issues with your posture, it can lead to a lot of spine and back problems, so it is better to improve it while you can.
Answer: Parasites
Explanation:
Both tapeworms and lice depend on a living host to survive. The relationship between the parasite, tapeworm or lice, isn't mutual. The parasite only benefits from the relationship, because the host provides them with plenty of nutrients. In some cases, tapeworms and lice can carry diseases and infect the host. So, there is your answer and goodluck!