Which statement best describes the cycling of carbon between the atmosphere and hydrosphere? Trees and plants releasing carbon through respiration
Volcanic activity releasing carbon into the atmosphere
Movement of gases from the ocean's surface by diffusion
Releasing of carbon into the soil when organisms decay

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.

the cover letter for a job search includes the skills one has for the particular job. including a cover letter is always a good idea, as it describes the ability to perform a task, and the employer can easily fetch the intention of the job you want to do.  

the cover letter is very important to be included in the job search document. hence, i strongly with the statement.