Definition of symbiosis: The definition symbiosis is how two organisms benefit or harm each other for example a crocodile benefits by having its teeth cleaned while a small bird benefits by getting free scraps. by eating the scraps.
Mutualism: Mutualism is a type of symbiosis in which both organisms benefit. For example a deer might eat some berries and get nutrients while the berry seeds get pooped out somewhere else where another bush will grow. Both organisms benefit because the deer gets to eat and there are more berries spread around. Everyone wins.
Commensalism: Commensalism is a type of symbiosis where one organism benefits and the other one is neither benefited or harmed. For example a peach benefits from the tree because the peach gets protection from anything on the ground trying to eat it because it hangs on one of the tree's high limbs and it also get enough nutrients to grow from the tree, the tree gets nothing but doesn't have a problem with that.
Parasitism: Parasitism is a type symbiosis where one organism benefits and the other is actually harmed. For example when you get bitten by a mosquito the mosquito gets the blood it wanted and the human might get a disease on top of the the fact that it lost blood.
How this connects to class: This connects to what we have been doing in class because food webs have everything to do with symbiosis because it is how one organism or species affects one another, and a food web is a whole ecosystem of things affecting one another.