Why do scientist use the light year instead of astronomical units to measure the distance between stars ?

Starting at the smallest, most simple level and working your way up to the most complex, explain how the following terms are connected. note-these terms are not in order molecules, atoms, organism, tissues, cells, organ systems, organs

Which hotel do you think is most likely to move ahead in market competition? a. a hotel that provides basic amenitiesb. a hotel that provides luxurious amenitiesc. a hotel that shows understanding of customers' latent needsd. a hotel that gives discounts

Kelly ran electricity though a sample of water using electrolysis. the water changed into two gases, x and y. it was not possible to break down the gases x and y into simpler particles.