Biology homework help

In nature, there are several examples of symbiotic relationships.  These relationships are vital to various ecosystems.  In this assignment, you will write an essay following the provided guidelines.
Introductory paragraph explaining or defining the term symbiosis and its importance in nature.
A paragraph devoted to mutualism, commensalism, and parasitism in which you define each term and describe a specific example highlighting the organisms involved and how the specific relationship depicts each.  Therefore, your body will consist of three paragraphs devoted to each of the above mentioned types of symbiosis.
Concluding paragraph in which you summarize your essay and bring it all together highlighting the most striking details of your paper.  Be sure to adhere to the rules of grammar, punctuation and sentence structure. Basically, use Standard English.  No text language or formats allowed and if used will result in major point deductions.