What are all examples of biotic factors running log, stream water, dead leaves, bacteria, soil

What are the similarities of physical and chemical change ?

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

What does the symbol (–hfus) indicate in a phase change?