Symbiosis
Def: Interaction between two different organisms living in close physical association, typically to the advantage of both
Moose and Ticks share a Parasitism relationship. The Moose is the host to the ticks. the Ticks, as the parasite, feed off of the moose, therefore benefiting themselves and harming the Moose.
The Bear and Berry bush share a Mutualism relationship. the Bear eats the berries, therefore benefiting from the Berries' nutrition. The Berries benefit from being eaten by having their seeds dispersed in a new area via the bears waste products, such as poop.
The Moss and White Spruce share a Commensalism relationship. The White Spruce provides an adequate living place for the Moss, therefore the Moss is benefiting. Meanwhile, the White Spruce is neither harmed nor benefiting, and could probably care less because it is tree.