What is the name of the functional group that is attached to this hydrocarbon?

Explain why scientists use shared characteristics to make cladograms.

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

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?