Different types of changes take place in ecosystems after they experience a disturbance. from june to september 1988, 51 different wildfires started in yellowstone park. by the end of the summer, approximately 794,000 acres of the park were affected, including about 24 percent of the whitebark pine forest population, many lodgepole pine stands, and a variety of other plants and animals.

materials water oxygen those are the things i can think of in this moment.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.