Cambrian explosion

Around 543 million years ago the Cambrian Explosion occurred, some say it may represent the most important evolutionary event in the history of life on Earth. The “Cambrian Explosion” refers to the rapid appearance of most major living animal body plans in the fossil record within 20 million years or less. This may seem to be a long period of time but is a relatively short in evolutionary history. This swift change in the fossil record appears to be inconsistent with the ideal of the slow process of evolution. Though, the fossil record has had rapid changes like this at other times, often following times of major extinction. The modern body plans we know of today is not what the major body plans looked like during the Cambrian Explosion.…

Cause of the Cambrian Explosion is an article that argues for a combination of factors that lead to the mass growth in animal population 541 million years ago. According to Smith and Harper, scientists have been proposing hypotheses on the cause of this event since the dawn of science. Hypotheses range from explosions in space to “intrinsic genomic reorganization” and many others. Most current ideas fall into three categories. They propose that, “The rapid diversification of animals in the…

The Cambrian explosion is referred to as “Biological Big Bang” (Science News) or “Evolution’s Big Bang” (Science) (Levinton, J. S.1992), because of the unexpectedness presence of animal life in the Cambrian. Figures have it that it started back 542 million years ago and terminated approximately 40 million years later. This era is marked by the emerging of profuse skeletonized metazoans, an abrupt intensification in biodiversity and the appearance of most modern lives (Von Bloh 18). Animals that…

In the second part of the lecture, lecturer Michael N Dawson shared with us the information in his research on Jellyfish. Before he jumped into talking about this topic, he first mentioned about the formation of marine lakes. Prior attending to this lecture, I have never heard of Marine Lakes and did not have too in depth knowledge about Jellyfish. However, after I listened to what lecturer Dawson’s presentation, I think the formation of marine lake are fascinating. When see water raised,…

1. Short summary of the history At 145 ± 4 to 66 million years (Ma) ago, Cretaceous period was the last period of the Mesozoic Era, right after Jurassic period and followed by the Paleogene period of the Cenozoic Era (International Commission Chart, 2014). 'Creta' in Latin means chalk and this is due to the large amount of calcium carbonate deposited by shells of marine animals thus resulting in large quantities of chalk (American Geological Institute, 1972). The shifting of continents as the…

the standard HE (high explosive) for the military. One block of M112 C4 weighs 1.25 pounds and has a TNT equivalent of 1.30. It is extremely stable, insensitive and powerful. The plastic explosive has a texture of clay and can be formed to any shape. Improvised explosive device (IED) IED’s are the weapons of choice for terrorist. They are crudely constructed bombs made from various conventional or homemade explosives and anything else available to the maker. “IEDs can be carried or delivered…

that killed four and wounded thirty-two others. In December 2007, four lives were lost and many other where changed when an explosion occurred at the Jacksonville Florida plant at T2 Laboratories, Inc. T2 was producing methylcyclopentadienyl manganese tricarbonyl, which is a gasoline additive. The explosion caused T2 Laboratories to become destroyed and also caused damage to other businesses in the area causing windows to burst and throw…

#27 Erick Roque The Exploding Lunch Bag Introduction “POP!” A balloon just blew up. But no, it was a plastic bag. But no one was there. So who blew it up? It turns out that it blew up by a mixture of vinegar, baking soda, and… WATER!!! What do you think, can you pop a bag with that mixture? Purpose The reason why I chose this experiment is because I have seen the reaction when both vinegar and baking soda go together… an explosion of vinegar. And if vinegar and baking soda can…

There are two basic types of fireworks that form the big displays in the sky: firecrackers and sparklers. They are made in different ways. Firecrackers are rolled paper tubes that are filled with gunpowder called black powder or a fuse and flash paper. As you light the fuse, fire burns along the fuse and when it reaches the powder there is a loud explosion. Sparklers, though, make colorful, long lasting light. They contain more ingredients which means they burn longer and produce a light and…

Explosion The explosion was a nice thing to learn if you want to be a bomb maker, I’m going to research the history about the bomb and explosion and then I’m going to research the step and the material about the bomb and how to make a bomb easy to carry and make the bomb not easy to be founded. If you want it to explosion, you have to have to material of that, so the material of that have a lot of kind such as: Octanitrocubane HMX Tetry Trinitrotoluene and the most famous one and the most…