Here are all the episodes he kisses her ! Coming Together-Kisses her before he leaves leaving only a Note. Summer's End-kisses her in the Rain while dating Kit and Amy wants him back but he rejects her..
Symbiosis occurs when two different species benefit from living and working together. When one organism actually lives inside the other it's called endosymbiosis. The endosymbiotic theory describes how a large host cell and ingested bacteria could easily become dependent on one another for survival, resulting in a permanent relationship. Over millions of years of evolution, mitochondria and chloroplasts have become more specialized and today they cannot live outside the cell.
Endocytosis is the process of one cell engulfing another. The endocymbiotic theory suggests that one prokaryotic cell engulfed another, and instead of being digested, the engulfed cell remained intact and functional. The two cells then formed a symbiotic (mutually beneficial) relationship.