Which of the following does not contribute to water vapour to the atmosphere

When you mate two plants together the terms is called? answer it fast as possible plz! i have a test tomorrow!

How many moles of carbon dioxide will form if 2.5 moles of c3h8 is burned

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space