Mitosis results in the formation of how many cells; meiosis results in the formation of how many cells? see concept 13.3 (page 262)

Mitosis results in the formation of two diploid cells while Meiosis results to the formation of four haploid cells. Mitosis is a process that takes place in the somatic cells; a cell that has doubled its genetic material divides to produce two diploid daughter cells while meiosis is a process that take place in the gamete cells where a doubled cell undergoes two rounds of division producing four haploid cells. 

Hydrosphere is the correct answer