Need a little help with chemistry:)
*if you don’t know don’t put anything*

In a closed or isolated system , matter can not be created or destroyed. it can change forms but is conserved true or false

Becquerel expected to find ( he developed the photographic plate that had sun-exposed minerals on top of it. becquerel expected to find ( he developed the photographic plate that had been in the closed drawer.

Here’s one way to follow the scientific method. place the missing steps in the correct position in the process