Which of these is a mixture?

Which property is used to identify the origin of an igneous rock? color density hardness crystal size

What are characteristics of minerals? select 3 choices

Which of the following can occur to two segments of a population if they are geographically isolated 1.) they can only share some types of genes 2.)both groups most likely become extinct 3.)they find a way to come back together 4.)eventually they become separate species