Sexual production is a means of recreating more of a species. Once there is a gene change whether for the good or bad, and solely if the organism survives to reproduce its gene, then it will be passed on to its children and going further on until there is a large amount of a species with that specific gene. This species evolved. Evolution occurs because of gene changes.
The dissolved sugars produced in the leaves of a maple tree move to the roots through the<em><u> phloem</u></em>. It is a tissue that transports nutrients to where it is needed
