Will give 30 ! 1. how did the ecosystem around the muskegon river change around 1900? 2. how had the ecosystem around the muskegon river changed by 1950? 3. what is only now showing up in the muskegon river? how can researchers know where this pollution came from?

1) water pollution 

2) soil and water 

3) watershed and the researchers know that the water pollution came from by 1- untreated smoke from factories 
2- carbon dioxide emissions

Ifound this on google “solar system formation. scientists believe that the solar system was formed when a cloud of gas and dust in space was disturbed, maybe by the explosion of a nearby star (called a supernova). this explosion made waves in space which squeezed the cloud of gas and dust.” i hope this you for what your looking for.