Mutualism and parasitism are two types of symbiotic relationships between organisms. In mutualism, both partners benefit from the relationship, enhancing their fitness. In parasitism, one organism (the parasite) benefits at the expense of the other (the host), which generally experiences a decrease in fitness.
An example of mutualism is the relationship between bees and flowers. Bees collect nectar from flowers for food, and in the process, they transfer pollen from one flower to another, aiding in plant reproduction. The "goods and services" provided are the nectar, which is a food source for the bees, and the pollination service, which helps the flowers reproduce.
In parasitism, an