Why do quartz and glass both have very high melting points ?

Balance this equation co2(g) + h2o (g) show that the balanced equation obeys the law if conversation of mass

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.

This drawing shows a human body system. what is the primary function of this body system?