There are many types and sizes of dinosaurs. There are gigantic types, which are the common types, and small-sized dinosaurs. Ironically, dinosaurs mean “Terrible lizard” and they are not even considered reptiles; they are a different type of animal. Additionally, they also disagree on how many years it took the dinosaurs to be extinct. Some scientists believe it took almost millions of years.
Some anthropologists say the small sections of DNA found are not conclusive evidence, because modern humans show just as much variation in DNA. These people point out that individuals such as the “Portugal Kid” are hybrids of Neanderthals and modern humans, showing there was gene trading. One argument against this is that there is no skull from the ‘Portugal Kid” so it is hard to compare it to Neanderthals. Also, it is known that closely related species can breed and their offspring can be fertile, but they are still separate species (Kunzig, 161). Ot... ... middle of paper ... ...ro-Magnon.
Although there may never be absolute evidence of why Hominids took those first crucial steps, evidence does suggest that human evolution went through many changes in order to make bipedalism the efficient way to travel. Bipedalism is the defining human characteristic that separates man from his early ape ancestors. Before the first Hominid stood upright and walked on two legs, his ape cousin traveled around on all four appendages that kept their hands busy from other constructive pursuits, such as making tools. It is not that there are no apes that can walk on two legs, but as Jennifer Ackerman put it, "Two-legged walking in a chimp is an occasional, transitory behavior." Chimpanzees and bonobos have been observed to walk on two legs for short periods of time, even using tools, however their anatomy doesn't permit extended bipedalism like a human.
The following information is a researched paper on the conditions and evolution that made human beings. There of course comes great controversy with this topic. Many scientists and people in general see the human race as completely evolved. The main and simple argument of anti evolution-debaters is that there is no record of humans evolving drastically in recent history. Another common argument is simply why are there still monkeys if we have evolved from them?
Savanna Theory Versus Aquatic Ape Theory of Human Evolution The evolution of man is constantly in question. While we are reasonably sure that modern humans and primates are both related to the same common ancestor, there is constant debate over what initially caused the two species to split into early hominids and apes. According to some, our longest and most popular theory on the division of man and ape is profoundly wrong. However, those same individuals usually offer an equally controversial theory as a substitute, one that is almost impossible to scientifically test or prove. Both the Savanna Theory and the Aquatic Ape Theory offer solutions to how and why humans evolved into bipedal toolmakers.
According to the Microsoft Encarta Encyclopedia ’98, the fossil evidence for direct ancestors of modern humans is divided into the category Australopithecus and Homo, and begins about 5 million years ago (See figure 1). Between 7 and 20 million years ago, primitive apelike animals were widely distributed on the African and, later, on the Eurasian continents (See figure 2). Although many fossil bones and teeth have been found, the way of life of these creatures, and their evolutionary relationships to the living apes and humans, remain matters of active discussion among scientists. The evidence for human evolution begins with the australopithecines. All the australopithecines were bipedal and therefore possible hominines.
After that, all record vanish. Although DNA tests show that modern humans and Neanderthals diverged from a common ancestor more than 500,000 years ago and that modern humans do not carry Neanderthal genes and so did not interbreed when they encountered each other 50,000 years ago, the discovery of possible hybrids suggests that we still have not fully completed the Neanderthal story.
Another comes from the world of science and is based on evidence that has surfaced over the last century. The theory of evolution comes into direct conflict with another theory that has been around for thousands of years, the theory of creation. The theory of evolution claims that humans have evolved over thousands of years from apes. The creation theory discredits evolution and claims that God created man. As the teaching of the theory of evolution has been accepted into most public schools, a new controversy has arisen about whether or not the theory of creation should also be taught in public schools.
(5-6) Nonetheless, within the hominids' relatively small time period there has been a wealth of genera and species that together create an only slightly-fuzzy line to ourselves as modern homo sapiens. The first major evolutionary split happened between our ancient ancestors and the ancestors of modern chimpanzees, gorillas, and orangutans; this split in hominoids creates the family of pongids, apes, and our family the hominids. Next diverged the ancestral chimps and hominidal forms, leaving us with the branch that would eventually lead to both Neandertals and modern homo sapiens. After this divergence, "four new species now appear between the chimpanzee and human: Ardepithecus ramidus, Australopithecus anamensis, Australopithecus afarensis, and Australopithecus africanus." (11) The earliest of these forms, Ardepithecus ramidus, differs from their chimp-like counterparts only in their dentition, notably the smaller, shorter canine.
No, it would not be enough. The universe had endless answers that were just waiting for the discovery of the gifted minds. If humans are primates then why humans do had a longer life span than the others? Scientist had conducted numerous studies about such and had installment possible reasons why humans had a longer life span than the other mammals. Accordingly studies had then categorized apes, monkeys, humans and others at the side of primates while the others mammals would be in the category of mammals.