Plz ! i need with these few questions and more questions soon

For number 16 the answer is : Cell cycle
why : because the repetition that a cell has to go through is called the cell cycle.

For number 17 the answer is : B
why : because mitosis is the creation of 2 daughter cells for duplication.

For number 18 the answer is : A
Mitosis is mainly used for copying the cell dna.

-procklown

It should be cryosphere and hydrosphere