As the solar system formed, most of its mass became concentrated in one part of it. what is that that part?

What is the number of moles in 15.0 g ash3?

The diagram shows the structures of horse and cat forelimbs. what does the diagram suggest about the evolutionary relationship between these two mammals? a. they have homologous structures, indicating a common ancestor. b. they have analogous structures, indicating a common ancestor. c. they have homologous structures, indicating that they do not have a common ancestor. d. they have analogous structures, indicating that they do not have a common ancestor.

Compare and contrast physical changes with chemical changes.