sentences: the sun is the source of energy for life on earth & organisms are a kind of life on earth -> the moon is the sink of matter for location on space the sun is the source of energy for organisms on earth  a beach is a kind of habitat / environment & environments are a part of earth -> a coast is a whole of space a beach is a part of earth  the sun is the source of energy for organisms on earth & a coast is a whole of space -> the sun is a source of energy for organisms on a beach