The milky way is your answer
Temporary changes would be weather, since it can change at any givin time another example would be tides coming in because they vary by day, or wet sand becoming dry sand!
All living things are made of cells. Within cells, there are tiny working parts called organelles. They each have a different job in the cell. A centriole is an organelle that helps cells divide, or make copies of themselves......
Centrioles are made of nine triplets of microtubules arranged in a cylinder.
For more info-
study.com/academy/lesson/centriole-definition-structure-function.html
A vaccine promotes immunity by injecting the user with the virus or illness to help the body figure out what to do and thus build a defense from it hoped I helped (: