1. Make sure the sport they are playing, that the item can't cause a real injury
2. Make sure the surrounding area is acceptable so like no slippery floor, or marble floor
3. Make sure every kid is doing the steps correctly or game, if not, then teach them and separate from kids doing good.
( I don't know if you meant ruled steps, so I made some, this is just what I think, hope it's what you want. )
An example of a mucous membrane is a oral mucous membrane.
What would happen if t. Brucei suddenly loss the ability to undergo antigenic variation
If T. Brucei lost the ability to undergo antigenic variation, it would cause it to not be able to hide itself from our defenses and our body would be able to fight it.
