Target 8
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Symbiosis
Parasitism
Parasite
Host
Commensalism
Mutualism
(Just in case you didn’t write them down, they are on pages
R71, R79, R80, and R85. Host is not in the textbook. I can also
turn back slides.)
An interaction between individuals from two
species that live closely together.
Parasitism
Commensalism
Mutualism
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A relationship between two species in which
one species benefits while the species it
depends on, its host, is harmed.
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Parasites are often
microorganisms.
Ex.
Tapeworms feed off
of nutrients from its
host, while the host
is deprived of
nutrients and gets
sick.

Tapeworm
Isn’t it GROSS?
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A relationship between two species in which
one species benefits while the other is not
affected.
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Commensalism is
common in oceans.
Ex.
Fish swim under
jellyfish for
protection. Nothing
happens to the
jellyfish.
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Fish
Aren’t they COLORFUL?
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An interaction between two species that
benefits both.
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Mutualism can be
necessary for
survival.
Ex.
Protozoans (a type of
microorganism)
break down wood
that the termites
can’t digest and get
a safe place to live.

Termite damage
That tree has a serious INFESTATION problem.