Carboniferous

The Earth is 4.5 billion years old. The Precambrian period lasted for 4 billion years. In this era, organic compounds came to earth and formed the first life of single-cell organisms. These single cell organisms evolved into bigger cells and also developed to have a sex. The oxygen levels on earth began to change which leads us into the Cambrian period. The Cambrian period lasted 53 million years and consisted of mostly shallow oceans covering the continents. Skeletons grew in life forms and new

Placoderms existed throughout the Devonian Period (about 416 million to 359 million years ago), but only two species persisted into the succeeding Carboniferous Period. During the Devonian they were a dominant group, occurring in all continents except South America in a variety of marine and freshwater sediments. The earliest placoderms were heavily armoured and were bottom-dwelling. Many later forms became

ancestor with mammals and birds, the amniotes, to the major orders, families and species of today is well known due to the fairly complete fossil record. The first fossilized amniotes discovered were dated to the early Pennsylvanian sub-period of the Carboniferous period, about 323 to 299 million years ago, in the stumps of the oldest extant vascular plant division, the lycopods, in Nova Scotia. This unique mode of fossilization proves the species was truly terrestrial (Carroll 1982). Based on both the fossils

Precambrian Time 4.6 bil.-544 mil. The earth is a Molten Lava World. The earth was formed by countless collisions of meteors/molten rock which made it a world of fire and molten rock. Temp. exceeded 8,000 degrees F radioactivity prevented the molten world from cooling quickly Scientists used radioactive dating to date the Earth.The earth is a Waterworld. Meteors with 5% water help cover the Earth with water, but it was mainly because volcanoes gave of huge amounts of carbon dioxide which formed

like the mammals or birds. It is used to classify a polyphyletic group of animals that are a subset of the larger group of Amniotes. The term is best described through a cladogram: [IMAGE] The reptiles first appeared in the early Carboniferous, having evolved from labyrinthodont amphibians. They had several distinct advantages over the amphibians that allowed them to flourish during the cold, dry Permian period. These lead them to be the most successful group of vertebrates

fish but more fish evolved from these first fish. The Acanthodians, or spiny fish, had jaws unlike the Aganthans. They had a short, deep body, five fins on it's belly and of course, it has spines all over it's body. These fish went extinct in the Carboniferous

Throughout the lifetime of the Earth, there have been various scientists who have hypothesized various extinction events. The following essay will cover the five major extinction events, otherwise known as the “Big 5 Mass Extinction Events”. According to Wikipedia (2016), a mass extinction is “a widespread and rapid decrease in the amount of life on Earth. Such an event is identified by a sharp change in the diversity and abundance of multicellular organisms”. The first major extinction event is

The NSAS area has been subjected to intensive geological studies by several workers (Ball, 1927; Sandford, 1935; Knetsch and Yallouze, 1955; Ibrahim, 1956; Said, 1962; Hume, 1965; Ambroggi, 1966; Ezzat, 1974; Pallas, 1978; Amer et al., 1981; Klitzsch and Wycisk, 1987, 1999; El Ramly, 1983; Klitzsch et al., 1987; Hesse et al., 1987; Schandelmeier et al., 1987a; Wycisk, 1987a, 1990, 1993,1994; E1 Gaby and Greiling, 1988; Klitzsch, 1989, 1994; Said, 1990; Hermina, 1990; Klitzsch and Squyres, 1990; Klitzsch

such chemical that reacts with oxygen to release energy, in particular heat. Most of the fuels that are in used today are fossil fuels; coal, gas, and oil. They were produced by plants which photosynthesized millions of years ago, mostly in the Carboniferous period. ( ). These chemicals are also important raw material for chemicals such as dyestuffs and detergents. They are finite, which one day they will run out and not be replaced. An alternative is ethanol. By using ethanol, we become

Firstly, the rainforest’s wildlife demonstrates earth’s 8 evolutionary stages: The “Age of the Pteridophytes”, the “Age of the Conifers and Cycads”, the “Age of the Angiosperms”, along with the seperation of Gondwana, biological evolution and radiation during thirty-five million years of isolation, the beginnings and radiation of songbirds, the integration of Australia and Asia flora and fauna, and finally the tremendous effects of the Pleistocene glacial periods on tropical rainforest vegetation