Answer:
Tardigrade or a devil worm
Explanation:Here is the link were I got the information from.https://sciencing.com/creatures-that-would-survive-an-apocalypse-13725305.html
sex cell and germ cells
Explanation:
in the DNA, stem cells
Answer: number 1
Explanation: that is when we could first sustain life because that is when we gained atmosphere and when we could hold carbon and oxogen