How do changing environmental conditions affect an ecosystem? (i will give a lot of points to the person who does this! let me know when you finished it! ! )

Intro: The green world hypothesis proposes that the balance of predatory carnivores and herbivores prevents the destruction of plant life. Trophic cascade, an ecological phenomenon triggered by the addition or removal of top predators and involving reciprocal changes in the relative populations of predator and prey through a food chain, which often results in dramatic changes in ecosystem structure and nutrient cycling. A predator at the top of a food chain that is not preyed upon by any other animal an apex predator is usually defined in terms of trophic dynamics.Community, also called biological community, in biology, an interacting group of various species in a common location. The term biological community refers to all the living components in an ecosystem. Food Chain  the sequence of transfers of matter and energy in the form of food from organism to organism. Food chains intertwine locally into a food web because most organisms consume more than one type of animal or plant.The carrying capacity of a biological species in an environment is the maximum population size of the species that the environment can sustain indefinitely, given the food, habitat, water, and other necessities available in the environment.

Resources: socratic.org, prezi.com, earthsky.org, www.merriam-webster.com.

I'm not sure what PT stands for in the Method section and i also don't know what i could put for results, discussion,. That is all stuff that is shown in the class, but if you can message me the video or anything i will be glad to look.

where is the scientific experiment?