Plzz helpp. What is the difference between melting and burning a substance? Is mass conserved in either 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.

Which of the following elements would you expect to have the lowest ionization energy value? fluorine, lithium, neon, nitrogen

How have the greenhouse gasses increased from the year 2000 to 2018