I need help writing an essay with this prompt: Describe how scientists think life may have originated on Earth

Question

I need to use the following terms also:

Ozone layer, endosymbiosis, Photosynthesis, Prokaryotic cells, Eukaryotic cells, Aerobic organisms, organic molecules, and Archaebacteria. Please help!!

Answer 1

Bacteria appeared on earth between 3.4 and 4 billion years ago. Precambrian evidence of filamentous bacteria-like structures, found making up fossilized sediments called stromalites, has been discovered in Australia and southern Africa. These fossils date back between 3.4 and 3.5 billion years old. Environmental conditions of earth 4 billion years ago were much different than those of today. It has been theorized that the atmosphere was a reducing atmosphere with intense lightning, tremendous volcanic activity, very little oxygen, intense ultraviolet radiation, and meteorite bombardment. These conditions made it impossible for any type of aerobic life to exist. The first cells may have originated by chemical evolution in an anaerobic environment.
A.I.Oparin postulated, in the 1920's, that primitive earth with its reducing atmosphere favored chemical reactions that produced simple monomers that eventually formed complex organic compounds necessary for life. Stanley Miller and Harold Urey tested this hypothesis by building an apparatus to simulate the conditions of the earth at that time. Their experiments produced 20 amino acids and other organic compounds including: ATP, lipids, some sugars, and the bases of RNA and DNA. The main problem of organic synthesis is how did these molecules develop without the aid of enzymes to speed up the reactions? Sidney Fox, of the University of Miami, dripped a dilute solution of organic monomers onto hot sand, clay , and rock. The water vaporized and left behind polypeptides he called proteinoids. Clay was abundant in prebiotic earth. Clay has the ability to act as a substrate for this type of chemical reaction. The charged sites on the clay attracted monomers in such concentrations to bring them into close proximity for chemical binding. Once these organic compounds were produced, aggregates of these proteinoids self-assembled into small spheres called protobionts. These small spheres were capable of osmotic swelling and shrinking and even able to produce a membrane potential.
Evidence to support the idea that RNA was the first genetic material includes: short polymers of self-replicating RNA have been abiotically produced in a test tube without enzymes. RNA has the ability to act as a catalyst to help make mRNA, tRNA or rRNA. The RNA folding is unique depending on its sequence. This along with mutations, creates a variety of closely related molecules. Through chance this self-replicating material was captured by the protobionts and the entire structure developed under the guide of natural selection.

Other Origin Theories:

Panspermia. Extraterrestrial organic compounds located on the surface of meteorites could well have contributed to the pool of material found on prebiotic earth. Modern meteorites have given up specimens of simple organic compounds such as amino acids.

Some researchers believe that life began on the sea floor away from the harsh surface environments. The discovery of deep sea vents showed the scientific community that the materials needed for life to begin were present away from the harsh surface.

Answer 2

life did come from outer area for a number of them. question is the place did the human beings come from. by utilising the way if adam and eve had an entire grown human physique in heaven would not that fluctuate the theory of ways we human beings got here to earth, doesnt it say the theory of evolution for individual is incorrect. the place is it incredibly is declared each and all the animals and plant life have been created to serve human beings. Um no offense to absolutely everyone. Oh and yet another element we human beings weren't the 1st smart life to inhabit earth, we are the 2d. those that got here first are called the Jinns, they only approximately have been given worn out yet very few srvived. i've got self assurance that occurred sixty 5 milions years back, while the Dinosaurs have been worn out.

Answer 3

Big subject.
Look up abiogenesis in google.

Below is a link which may help.