What is the best estimate for how long there has been life on earth?

i think the miocene epoch spans the time from 23 million to 12 million years ago.

the answers are as following:

1. c. double helix, nucleosome, coil, supercoil, chromosome

2. b. g2 phase, preparation for mitosis

3. d. interphase consists of the g1, s, and g2 phases

4. c. metaphase

5. a. chromosomes are duplicated before cell division so that each new daughter cell has a complete set

answer; benefit; harmed;

the answer is c. have a great day; )