This article describes how to compose a cover letter for teachers. My doctoral dissertation examines human cognitive ability and the socioecological underpinnings of behavioral variation, using qualitative survey-based research methods.
Or even better, a full-time job! It should be clear, concise, and free of spelling and grammatical errors. If you are trying to become a biologist, then explain what you learned in your biology classes. Try not to duplicate much information in both texts. Even one page of text can be excessive.
Writing a resume and cover letter can be a challenge when you don't have much practice - or work experience to include. As my Curriculum Vitae demonstrates, I have taught a variety of ethnographic writing courses.
Do not conduct experiments. If you do not want to get jobs, there is nothing easier than sending one cover letter to all the offers you are applying for. What niche can I fill?
Avoid talking about how much you want the job; instead, focus on how you will help out the company. If at least one answer is yes, you need a good teacher CV.