<span>tree and nest If a robin builds a nest in a big tree, the robin benefits and the tree
is not helped or harmed. This type of symbiotic relationship is called
commensalism, and it is between the tree and the nest/Robin.
<span>There
are several types of biotic relationships that is occurring every
single moment in the ecosystem and commensalism is one. In contrast,
parasitism is the biotic relationship where one organism doesn't benefit
from the other and is harmed. In this scenario with human beings and
mosquitos, this phenomenon of interaction is distinguished as parasitism
where mosquitos draws blood that contains nutrients from the human
tissue to use it as its source of food and then leaves harmful
substances and bacteria in the human’s blood stream.<span> </span></span></span>
