A spruceis a tree of the genus Picea(a genus of about 35 species of conferous evergreen trees in the Family Pinaceae, found in the northern temperate and boreal(taiga)regions of the earth
The substance you are referring to is glucose. Glucose is a simple sugar that is broken down from the food we eat and is an essential energy source for cellular respiration to produce ATP.
Mutualism- *Humans and Plants (We breathe out carbon dioxide then the plants absorb it then release oxygen.... etc.) Humans and plants both benefit from this relationship Commensalism- *Killdeer Birds and Cape Buffalo (the Killdeer Bird lies down on the buffalo and the buffalo protects the Bird. But the bird DOES NOT harm the buffalo.) Birds benefit, but Cape Buffalo is not affected. Parasitism- *Ticks and Humans (The ticks suck the blood and is therefore benefited, but does not benefit the human, but harms them instead.) The ticks benefit, but humans are harmed.