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

The precambrian period is characterized by the time extending from 4.6 billion years ago to the beginning of the Cambrian period.

The Precambrian period is said to be started when the Earth began to form, which is 4.6 billion years ago. It lasted till 541 million years ago, the period of the beginning of the Cambrian era.

The Precambrian era covers approximately 80-90% of the Earth's geologic time. In centimeters, the Precambrian period measures 300 centimeters and was 4.056 billion years long.

Thus, the Precambrian period occurred before Cambrian and was 300 centimeters long than the rest of the scale.

To know more about the Precambrian era, refer to the following link:

link

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.

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

credit: gradman555p98x9p

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