Essay Sample on Stromatolite

Introduction

A stromatolite is a layered deposit mostly of limestone. The evolution of blue-green algae forms it also referred to as primitive one-celled organisms. The structures are usually categorized by dark layers which are flat, dome-shaped, and hummocky or a thin alternating light. The trapping of residues mostly forms these alternating layers washed up in the storms periods and through limestone precipitation via the blue-green algae on others. The reason we should care about stratomite is that it is a source of nourishment for various species and the environment as a whole. Stromatolites offer a most an early record of life on the universe by remains of fossils. It is a bacterial-mediated rock.

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The oldest stromatolite exists in Western Australia. Their evolution in the Archaean Aeon was perhaps because of the rise of continents in that time. This increased in the shallow-marine environments surface area. Since they can't develop in deep water, calcification is not less than 4 meters. They require optimum geochemical environments, principle community arrangement and selective metabolism for their ideal growth. They are shaped by the sediment influxes, storms, water depths, and tides. Today, stromatolites live in an extensive range of environment extending from even soils, shallow shelf to lakes and rivers.

Eukaryote cells comprise membrane-bound organelles which include the nucleus while Prokaryote cells there no membrane. A prokaryote is simple, minor cells compared to Eukaryote which has complex cells and large designed (Vellai and Gabor 1573). Eukaryote cells have originated from prokaryotic cells but comprise diverse kinds of organelles. Prokaryotic cells are the greatest primitive kind cells lacking new structures compared to the eukaryotic cells. Prokaryotic cells chromosomes are usually single with no histones compared to eukaryotic cells that have multiple direct with histones. Eukaryotic cells cell division entails mitosis compared to prokaryotic cells whose cell division involves the binary fission of growing.

Ediacaran fossil is an excellent example of abundant minerals (Narbonne and James 28). They are frond-like form and said to have been attached to the sea floor. They filter small particles of food. There are also the disk-shaped forms called the Aspidella which represents the organisms and also referred to as hoard fasts. The verged form Dickinsonia and silly putty cast range in size in a few centimeters to tens of centimeters. Some scientist advocate for these Dickinsonia. The strange three begged spiral form is referred to as Tribrachidium. Eoandromeda specimen originates from Australia which is also popular in China. Spriggina is another phrasal that has its ends differing from each other as well as having a bilateral symmetry. Its right half is a mere image of the left half. Parvancorina is a small phrasal that has bilateral symmetry. Kimberella is considered as the oldest Praetorian animal phase. Funisia is found in Australia and lived in dense creeping of raided individuals.

The world's crust transformed 3.2 billion years ago. These new outcomes offer an enhanced understanding showing how the climate and oceans are influenced by the world's lithosphere which is the crust, and the top, solid stratum referred to as the mantle. The Archean Eon has no initial time limit. By evidence, there is a universal acceptance that the Archean Eon started around 3.8 billion years ago and ended at 2.5 billion years past. It contains approximately 45% of the world's history. Nearly 3.6 billion years ago, there was declined levels of oxygen, and the oceans were decreasing the number of ingredients required for life to grow into more difficult organisms. It is therefore evident that a slow rate of evolution was associated with low levels of biologically-important basics and oxygen in the oceans.

Works Cited

Vellai, Tibor, and Gabor Vida. "The origin of eukaryotes: the difference between prokaryotic and eukaryotic cells." Proceedings of the Royal Society of London. Series B: Biological Sciences 266.1428 (1999): 1571-1577.

Narbonne, Guy M., and James G. Gehling. "Life after snowball: the oldest complex Ediacaran fossils." Geology 31.1 (2003): 27-30.