<P> A pheromone ( from Ancient Greek φέρω phero `` to bear '' and hormone , from Ancient Greek ὁρμή `` impetus '' ) is a secreted or excreted chemical factor that triggers a social response in members of the same species . Pheromones are chemicals capable of acting like hormones outside the body of the secreting individual , to impact the behavior of the receiving individuals . There are alarm pheromones , food trail pheromones , sex pheromones , and many others that affect behavior or physiology . Pheromones are used from basic unicellular prokaryotes to complex multicellular eukaryotes . Their use among insects has been particularly well documented . In addition , some vertebrates , plants and ciliates communicate by using pheromones . </P>
<P> A pheromone ( from Ancient Greek φέρω phero `` to bear '' and hormone , from Ancient Greek ὁρμή `` impetus '' ) is a secreted or excreted chemical factor that triggers a social response in members of the same species . Pheromones are chemicals capable of acting like hormones outside the body of the secreting individual , to impact the behavior of the receiving individuals . There are alarm pheromones , food trail pheromones , sex pheromones , and many others that affect behavior or physiology . Pheromones are used from basic unicellular prokaryotes to complex multicellular eukaryotes . Their use among insects has been particularly well documented . In addition , some vertebrates , plants and ciliates communicate by using pheromones . </P>
hormones are one chemical signaling system in animals . what is the other one
hormones are one chemical signaling system in animals . what is the other one
pheromone
pheromone