 It
literally means “together life”. It refers
to organisms that live in close
approximation; often they cannot live
without each other.
 Top
flap)
 Relationship
in which one organism (the
host) is the source of food and/or shelter
for the organism (the parasite)
 *Parasite benefits/ Host is harmed*
 Examples:
 Tick feeding on blood of a dog
 Head lice on human scalp
 Tape worm in intestines
 Mistletoe putting roots into host tree.
http://www.youtube.com/watch?v=5d
DjmkWojE8
 Neither
species is hurt in anyway, they
both receive a benefit from the
relationship.
 *Both Benefit*
 Examples:
 Bees and Flowers
 Bacteria living in cow’s intestines, help
break down cellulose.
 Honey guide bird leads honey badger to
honey, they both eat.
 One
organism benefits from the
relationship while the other is neither
helped or harmed.
 *one benefits/one not helped or
harmed*
 Examples:
 Barnacles living on a whale
 Remoras attach themselves to a sharks
body. They eat sharks food scraps and
have protection.
Mutualism
Parasitism
Mutualism
Commensalism
Parasitism
Commensalism
Mutualism