Precambrian

environmental justification of the explosion happening. "Snowball Earth" hypothesis states that before the Cambrian explosion, the whole universe was covered with ice. Glaciers restricted evolution functions in the sea, like blocking rays of the sun from penetrating the waters yet algae and cyanobacterial mats rely on it. When retreatment of glaciers happened, a change of life was earned for many organisms. Particulary, the post post-glacial period proved vital for evolution, as it is said that huge complex multicellular organisms appeared when the temperatures were rising proving that the environment was favorable for evolution. As for the developmental evidence, scientists say that the environment never had nothing unique during the Precambrian-Cambrian transition, and it was a necessity for evolution to happen for diverse and new body plans to emerge. In animals, developmental genes are the ones responsible in…

Precambrian time covers the tremendous greater part of the Earth's history, beginning with the planet's creation around 4.5 billion years prior and finishing with the development of complex, multi celled life-shapes very nearly four billion years after the fact. The Precambrian is the most punctual of the geologic ages, which are set apart by various layers of sedimentary rock. Set down over a huge number of years, these stone layers contain a lasting record of the Earth's past, including the…

To start off the exhibit is the Precambrian period. The Precambrian period lasted for 4 billion years. Scientists believe that this period where 90%of earth's history was discovered. Life first started evolving, and progresses and changed the planet. Scientists discovered the truth about organic compounds, the first prokaryotic cells and the first meteorites to hit the earth. Scientists believe that some of these meteorites gave rise to organic compounds, or life's building blocks. The Cambrian…

In the Precambrian Shield there are no continuous aquifers and ground water is only found in the fractured and weathered zones of Precambrian rock. These various aquifers are located primarily in gneiss and granite. The Precambrian shield only makes up a small portion of eastern Bolivia. Aquifers in this province are generally shallow at depth less than 90 meters and due to this many of the aquifers are biologically contaminated near populated areas (Roebuck et al. 2004). Majority of the ground…

Way back when, humanity had such a strong past. Nothing appeared. Time was time. Nothing is nothing. The four eras that made history. Precambrian, Paleozoic, Mesozoic, Cenozoic. Historians and Scientists, did research for years and years. What happened during the Precambrian Era, nobody had a clue. Until humans researched the resources left behind. Back in the Precambrian Era . Earth was born. 4.6 million years ago, not even that many.! Stars and the planets were too! Rocks and much…

Prehistoric times have been a mystery for modern humans for centuries. These times span from the formation of the Earth, about 4.5 billion years ago, all the way to the Iron Age, which ended about 3,200 years ago. This paper will be discussing the Precambrian times first, due to it being the oldest period in Earth's history. The next paragraph will talk about the Phanerozoic eon, which contained the first forms of life on Earth. The last paragraph will be about the most recent period, which has…

includes 540-million-year-old ripple beds and ancient pre-Cambrian lava flows in exposed quarries. There is a M54 motorway near the Quarries, giving it easy access to the Quarries. The motorway was constructed in 1974, near the northern end of the hill. There are Five Quarries in Ercall. Only Quarry One, Two and Three were visited, as Quarry Four and Five have outgrown vegetation and therefore making it hard to survey the location. At Locality 1 the quarry face is exposed, it is 10-metre high,…

the south and east. The Highlands of Scotland are largely mountainous, and form the highest ground in the UK; they are bisected by the Great Glen into the Grampian Mountains to the southeast and the Northwest Highlands. The Scottish Lowlands can be further subdivided into the Southern Uplands, an area of rolling farmland and high moorland, and the lowland farmland of the Central Belt and eastern Scotland. Scotland has an incomparable variety of geology for an area of its size. It is also the…

with each other. That can also can include non -living environments like (weather, earth, sun, soil,climate,atmosphere). In Alberta the Canadian Shield takes 1% of Alberta. It is in the north of Alberta. So its nowhere near Calgary. The Canadian Shield has climate changes. Winter are about six to eight months long. The Shield has very short summers. In the summer It is hot and rainy. It is also dry. Parts of the su mmer the sun does not set untill…

Chordates are believed to have evolved from Deuterostomes, a superphylum which consists of vertebrates. The main characteristic of Deuterostomes is their embryological development, where the blastosphere develops into the anus, and the mouth is developed at the opposite end. The digestive tract than forms in between the anus and the mouth, connecting both to each other. The earliest fossil record of Deuterostomes, the Kimberella, an organism similar to a jellyfish, is believed to have…