Relationships Between
Living Things
Lab Book p. 82
Symbiosis

An ecological relationship between
organisms of two different species that
live together in direct contact
Commensalism


A relationship in which one organism is
HELPED and the other is NOT HARMED
Examples:


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Tree and Orchid (Brainpop)
Buffalo and birds (eat flies)
Remora and Shark
Sea anemone & clown fish
Mutualism


A relationship in which BOTH organisms are
HELPED.
Examples:



Crocodile & Egyptian plover bird (Brainpop)
Tick Bird & Rhino
Tiger Groupers and Cleaner Gobies
Parasitism


A relationship in which one organism is HELPED (it
is the parasite) and the other organism is hurt but
not KILLED (it is the host).
Examples: Which is the parasite & which is the
host?

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Termite & Tree
Flea & Dog
Botfly & Mammal (Brainpop)
Tick & Rhino
Virus & Human
Predator/Prey


This relationship is between two animals.
One organism is HELPED or FED (predator)
and the other one is KILLED & EATEN
(prey).
Examples: Which is the predator & which is
the prey?

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Bear & Fish
Human & Deer
Hawk & Jackrabbit (laser disc)
Sea lion & sunfish
Sea otter & puffer fish
What kind of relationship do each of the
following have?
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Bird & Worm
Bird & Tree (with a nest)
Cow Bird & Cow
Cow & Mosquito
Tree Fungus & Tree