I need to know what the question is asking please help

Which of these best describes the scientific process

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.

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3