Humans are organisms that live on the surface of the Earth. In recent years, many products that people use have released chemicals into the air. This has slightly changed the composition of the air that surrounds the planet.

Which statement describes this interaction?

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.

Can someone me with questions 15 to 17 plz.

Acompound has a molecular weight of 12.124 atomic mass units and the empirical formula c3h40. what is the molecular formula of the compound?