Infectious disease is a sickness that can be passed one to someone else, like the flu. a lifestyle disease are sicknesses that you can not get or give to other people.
I think they are cleaned with vinegar.Im not sure.
A lack of a color change can indicate there was no chemical reaction between two substances that were mixed. Hope this helps! :)
I'm not exactly sure what makes fossils but they used to not have hard bodied organisms they were soft.
Answer:
Evolving takes thousands of years
Explanation:
Take dinosaurs for example they are now chickens and other birds. Evolving takes over hundreds to thousands of years