Starting in the 1940s, park managers, biologists, conservationists and environmentalists began what would ultimately turn into a campaign to reintroduce the Grey Wolf into the Yellowstone National Park. When the Endangered Species Act of 1973 was passed, the road to legal reintroduction was clear. In 1995, Grey Wolves were first reintroduced in the area. The history of wolves in Yellowstone National Park chronicles the extirpation, absence and reintroduction of Grey Wolves, and how the reintroduction was not without controversy or surprises for scientists, governments and park managers.
The wolves were brought in because the increased elk population was overgrazing the deciduous, woody species such as aspen and cottonwood.

●      two parasitic organisms;

Scabies, also known as the seven-year itch, is a contagious skin infestation by the mite Sarcoptes scabiei.
Inonotus obliquus, commonly known as chaga mushroom is a fungus in the family Hymenochaetaceae. It is parasitic on birch and other trees.

●      the ecological niche of two characteristic animals;

The position of a species in an ecosystem in terms of the physical characteristics of the are where the species lives and the function of the species in the biological community.
The gray wolf's niche in their ecosystem is: Hunt in packs, Have a small amount of cubs - mostly two offspring Has no natural predators - top predator in its niche, Feed on any animals to survive. This includes animals both smaller or larger than them / alive or dead. May clash with other predators like the puma or bear. Gray wolves help even out the population by eating other animals both large and small. Apex Predator - They are the cornerstone of their ecosystem. They "filter" their ecosystem by getting rid of old injured animals. This also then provides food for scavengers. Gray wolves play a critical role in their ecosystem since there are predators for them.
On the Other hand, deer live in mixed forests habitats, on wooded farmlands and even in suburban areas of established cities. In winter they take to coniferous forests for shelter. Deer are a prey species, providing food for coyotes, bobcats, cougars, wolves and occasionally humans. In turn, the species helps keep vegetation in check.

●      two organisms that share the same food (niche partitioning) and the way that they manage it;

An good example is the Galapagos Islands.

●      based on the simplified trophic pyramid found in slide 6 of the resource topic 2.1 'Relationship of organisms in ecosystems', make an analogous one with plants and animals from your own BioArea.

As we see in the picture, herbivores eat plants, and carnivores eat herbivores. As a result, this pyramid is created. In my BioArea we can see most of the species depected in the pictures, such as plants, insects, worms, frogs and amphibians in general, as well as wolves.