Not true, certain chemical transmitters stimulate certain receptors
Since bees and butterflies both pollen are flowers, the growth (population) of flowering plants would become less common without the pollen being spread.
Endocytosis and exocytosis are similar in that they are both forms of cell transport. They differ because in endocytosis, a cell transports molecules into a cell (think: endo - in), and in exocytosis, the cell's molecules are transported by being expelled.
