A typical person has an average heart rate of 74.0 beats/min. Calculate the given questions. How many beats does she have in 3.0 years? How many beats in 3.00 years? And finally, how many beats in 3.000 years? Pay close attention to significant figures
in this question

Decomposition is the cycle at which bacteria breaks down any organic material into the soil

Vander waals forces are inter molecular bonds that exist within molecules of the same substance. a water molecule is made up of oxygen and hydrogen atoms which share electrons between each other. the vander waals forces are forces that exist between multitude of different  molecules of water. dipole dipole forces is the type of vander waals force that exist in water. the oxygen atom which is more electronegative pulls the shared electron closer to itself thus generating a partial negative charge while the hydrogen acquire a partial positive charge. these two different charges causes attraction to occur in water molecules.