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James W. Valentine says that the first organisms were archaebacteria, primitive cells without nuclei. These cells may have evolved in waters with extremely high temperatures and no oxygen. Cyanobacteria, more advanced organisms, evolved from 2.5 to 3.4 billion years ago. Cyanobacteria carried out photosynthesis, a process that traps the energy of the sun and uses it to build glucose, an organic molecule, from water and carbon dioxide. Organisms that used photosynthesis no longer had to depend on organic molecules dissolved in water, and released oxygen so that the atmosphere and oceans became more favorable environments for advanced life forms. .
Advanced cells may have evolved through distinct simple cell types, According to James W. Valentine. Large cells may have incorporated smaller cells that evolved into chloroplasts and some tiny aerobic bacteria that evolved into mitochondria. Advanced cells also may have been formed from prokaryotic cells. Single-celled eukaryotes then developed complex modes of living and advanced types of reproduction that led to the formation of multi-celled plants and animals. About 700 million years ago the first multi-celled organisms were formed. At that time, free atmospheric oxygen and food and plant supplies became more stable. .
About 700 and 570 million years ago, modern animals and their body structures began to change dramatically. Early fossils mainly belong to jellyfish and other simple organisms. At about the same time, fossil burrows were found. This signals a change to more advanced body structures. Just before 570 million years ago, skeletons developed independently in some animals. Fish arose from worm-like creatures by evolving to have a stiff dorsal cord and, eventually, an internal skeleton that allowed them to swim.
Before complex animal communities could develop, plants had first become established to support the animals. The small plant-eaters would then become the food of predators and scavengers.
What is evolution? ... Evolution also has two subunits which can be divided into micro evolution and macro evolution. The kind of evolution documented above is micro evolution. ... I think the difference between the two is senseless because macro evolution is cumulative micro evolution. ... The word evolution has many different meanings. ...
Evolution The origins of mankind is an extremely controversial issue within today's society. ... One such argument is the conflict involving the theory of evolution versus the theory of creation. After extensive scientific research, it is apparent that the theory of evolution is correct. ... Similarities in these categories link species together and are therefore studied to support evolutionism. ... Darwin proposed that evolution occurred as the result of natural selection. ...
Evolution Evolution is the change that species undergo over time. ... Evolution can be found in fossil records and chemical and structural similarities. ... Probably the most popular evidence for evolution is the numerous fossils found over time. ... Therefore, evolution will have occurred. ... The most popular piece of evidence for evolution are the fossil records. ...
Discussion Assignment # 2, Topic 2 Conflicts between scientists and nonscientist's beliefs of evolution are nothing new to the scientific community. Scientists spend years solely on the research of evolution theories to provide evidence for evolution. This enables them to present facts and defend evolution as a truth. However, showing clear-cut evidence to a nonscientist that evolution exists still presents a major problem. ... Archeological fossils have been found that creates some evidence that points to more or less evolution. ...
Today's human being is the product of millions of years of trial and error through the process of evolution. Charles Darwin was the first to bring fourth the idea of evolution. ... Evolution is the most logical explanation for mans place on earth. ... Almost all scientists believe in some sort of evolution, though they may not agree on all the details they all agree that evolution is the reason for mans place on earth. ... Even with all the proof pointing towards evolution the majority of the world still believes in spontaneous creation by God. ...
The Theory of Evolution The theory of evolution creates tremendous controversy in today's society. Anything as controversial as the creation/evolution debate is bound to generate a diversity of opinions. ... I believe the theory of evolution should be banned from educational courses because of religious conflict. ... Much evidence can be provided against the theory of evolution. ... Evolution supports the idea that humans and apes evolved from a single common ancestor. ...
Creationists say that the evolution theory is biased and incomplete. ... The process of evolution, which all living things developed from unicellular organisms, over billions of years Exactly how evolution occurs is still debated but it is a scientific fact that it does occur. ... Evolution apparently has no built-in direction or purpose. ... It is clear that evolution is much clearer to understand and accept than the creationism theory. There will always be people who will still be curious as to how we appeared on the earth, and some people will oppose the evolution theory, therefore, the evo...
Theory of Evolution Today's human being is the product of millions of years of trial and error through the process of evolution. Charles Darwin was the first to bring fourth the idea of evolution. ... Evolution is the most logical explanation for mans place on earth. ... Almost all scientists believe in some sort of evolution, though they may not agree on all the details they all agree that evolution is the reason for mans place on earth. ... Even with all the proof pointing towards evolution the majority of the world still believes in spontaneous creation by God. ...
Today's human being is the product of millions of years of trial and error through the process of evolution. Charles Darwin was the first to bring fourth the idea of evolution. ... Evolution is the most logical explanation for mans place on earth. ... Almost all scientists believe in some sort of evolution, though they may not agree on all the details they all agree that evolution is the reason for mans place on earth. ... Even with all the proof pointing towards evolution the majority of the world still believes in spontaneous creation by God. ...
Theory of Evolution Today's human being is the product of millions of years of trial and error through the process of evolution. Charles Darwin was the first to bring fourth the idea of evolution. ... Evolution is the most logical explanation for mans place on earth. ... Theory of Evolution Today's human being is the product of millions of years of trial and error through the process of evolution. ... Evolution is! ...
