It is estimated that the age of the earth is 4.54 billion years +/- 0.05 billion years.
First life began (scientific guestimate) at 3.8 billion years ago. That is it took only 0.75 billion years for life to appear on the new world.
In universal terms that would be just an instant.
Let’s speculate how life started. We have an ocean called the primordial soup ( a sea of serendipitous synchronicity and coincidences) into which one day falls and asteroid bringing with it hydrocarbons.
One day a lightening bold this some of these hydrocarbons and a single cellular microbe is born
Which dies . There are only those were created by lightening then die. For how long did this occur??
One smart microbe gets the idea that it wants to continue living. Real smart, as it did not have a brain yet. So it goes on a trial and error trip and through countless generations realises that it needs a plan . Co incidently atoms are grouped to make different structures. The primordial soup creates proteins These combine and create structures. Some of which make up DNA which is of 3 parts :--
1 A Five Carbon Ring
2. Nitrogenous Base
3. A Phosphate Group.
A very obliging primordial soup supplies this on demand in just the right combinations of atoms. The first “Just in time” manufacturing logistic operation.
Great our microbe now has a plan. Poof it dies for countless more generations because it has the plan to make more microbes, but a plan is not a house built, so it dies.
So it gets the idea to make RNA which is both messenger/truck and workhorse..
OK now let’s look at DNA and RNA
DNA is a double-stranded molecule, while RNA is a single-stranded molecule.
DNA is stable under alkaline conditions, while RNA is not stable.
DNA and RNA perform different functions.
DNA is responsible for storing and transferring genetic information, while RNA directly codes for amino acids and acts as a messenger between DNA and ribosomes to make proteins.
DNA and RNA base pairing is slightly different since DNA uses the bases adenine, thymine, cytosine, and guanine; RNA uses adenine, uracil, cytosine, and guanine. Uracil differs from thymine in that it lacks a methyl group on its ring. All supplied just in time and place from the primordial soup.
OK now we have the microbe with not only the draft plans but also the builder to make the next microbe.. hang on Houston we have a problem! We need a brain (nucleus)to coordinate and we need a factory to make the building materials.
Time passes and it is now done Hey I am alive. I dis coved a way to reproduce along the way without destroying myself. Mitosis. I am alive and my own factory.
Was I the first microbe from which you evolved???
No because the plant DNA microbe produced the oxygen which I needed to breathe even in the water. I need oxygen to make the building block proteins and sugars on which I feed.
Although their functions are the same, plant and animal DNA is not the same. The main difference between plant and animal DNA is due to their base sequence arrangement.
Both plant and animal DNA molecules are formed from the same four nucleotides, but the only difference lies in the order of the base sequences. The sequence of the bases decides on the proteins to be synthesized. The arrangement of the nucleotides will determine how the plant or animal will turn out to be and what traits it will possess.
Another differentiating point between plant and animal DNA is that plant DNA is slightly larger than animal DNA. Also, the isolation of plant DNA is more difficult than that of animal DNA.
Despite being so different from each other, both plant and animal DNA perform the same function, which is expression of hereditary characteristics and cellular development.