1. How long (in centimeters and years) was the Precambrian period compared to the rest of the scale?

Due to how much space that would be left after plotting the eras left (15 cm was the graph), Precambrian period spanned the whole plot but had an arrow showing it extended beyond the graph.

Explanation:

The Precambrian era embraces both the Archean and Proterozoic eons, which can be considered as formal geologic intervals that lasted from 4 billion to approximately 541 million years ago, and the Hadean eon, considered as an informal geologic interval is believed to span from between 4.6 billion to 4 billion years ago.

Precambrian era = [Archean eons] + [Proterozoic eons] + (Hadean eon)

Where [ ] - implies formal geologic intervals

and () - implies formal geologic intervals

To answer the question - How long (in centimeters and years) was the Precambrian period compared to the rest of the scale?

Here are the steps to get the plot;

• Set a scale to use to make your model

Probably use centimeters as the unit of your scale - 1 block gives about 5 centimeters to be exact on the graph.

• Use this scale - for your calculations

Divided the 20 centimeter ruler by 5 and got 4, simply make each block 4 centimeters so they were each even in the plot

• Make a plot of years (length of timescale) against species

Includes the eras and their periods e. g. Quaternary Period, Cenozoic Era - Tertiarty Period "Primitive Horses", Cretaceous Period "Last Dinosaurs", Jurassic Period "Quarry Dinoasaurs" and Mesozoic Era

• Based on the scale you used above how long (in centimeters) was the Precambrian period compared to the rest of the scale?

Due to how much space that would be left after plotting the eras left (15 cm), Precambrian plot spanned the whole plot but had an arrow showing it extended beyond the graph.