both species benefit from the relationship. (cleaner fish help other fish.)

mammals have a special organ that takes nourishment from the mother's blood to the baby.

one species benefits the other is harmed. (Lamprey feeding on a bony fish.)

One species benefits from the relationship and the other is not affected. (Pilot fish and Shark)

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Science 5th grade

Bonus Words

Question	Answer
Oviparous	means egg laying
Viviparous	means live birth
Mutualism	both species benefit from the relationship. (cleaner fish help other fish.)
Placental	mammals have a special organ that takes nourishment from the mother's blood to the baby.
marsupial	non-placental order of mammals
monotremes	non-placental order of mammals
Parasitism	one species benefits the other is harmed. (Lamprey feeding on a bony fish.)
Commensalism	One species benefits from the relationship and the other is not affected. (Pilot fish and Shark)