PLEASE I NEED HELP How long (in centimeters and years) was the Precambrian period compared to the rest of the scale?

How many years and “centimeters” of time separated the dinosaurs and humans on Earth?

How many years and centimeters of time passed before life appeared on Earth?

For how many years of geologic time have humans existed?

Did dinosaurs exist at the same time as mammals? Explain your answer using the geologic time scale.

Answer is to avoid experimental error

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na