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Evolution is the process of change in all forms of life over generations, and evolutionary biology is the study of how evolution occurs.
Life evolves by means of mutations (changes in an organism's hereditary information), genetic drift (random change in the genetic variation of a population from generation to generation), and natural selection (the non-random and gradual process of natural variation by which observable traits (such as eye color) become more or less common in a population).
To understand the origin of whales, it's necessary to have a basic understanding of how natural selection works: It is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits. Changes that allow an organism to better adapt to its environment will help it survive and have more offspring. Natural selection can change a species in small ways, causing a population to change color or size over the course of several generations. This is called "microevolution." But natural selection is also capable of much more. Given enough time and enough accumulated changes, natural selection can create entirely new species. It can turn dinosaurs into birds, apes into humans and amphibious mammals into whales.
The physical and behavioral changes that make natural selection possible happen at the level of DNA and genes. Such changes are called "mutations." Mutations can be caused by chemical or radiation damage or errors in DNA replication. Mutations can even be deliberately induced in order to adapt to a rapidly changing environment. Most times, mutations are either harmful or neutral but in rare instances, a mutation might prove beneficial to the organism. If so, it will become more prevalent in the next generation and spread throughout the population. In this way, natural selection guides the evolutionary process, preserving and adding up the beneficial mutations and rejecting the bad ones.
Misconception: “Evolution is a theory about the origin of life.”
Response: Evolutionary theory deals mainly with how life changed after its origin. Science does try to investigate how life started (e.g., whether or not it happened near a deep-sea vent, which organic molecules came first, etc.), but these considerations are not the central focus of evolutionary theory. Regardless of how life started, afterwards it branched and diversified, and most studies of evolution are focused on those processes.
This shows more a misconception about thermodynamics than about evolution. The second law of thermodynamics says, "No process is possible in which the sole result is the transfer of energy from a cooler to a hotter body." [Atkins, 1984, The Second Law, pg. 25] Now you may be scratching your head wondering what this has to do with evolution. The confusion arises when the 2nd law is phrased in another equivalent way, "The entropy of a closed system cannot decrease." Entropy is an indication of unusable energy and often (but not always!) corresponds to intuitive notions of disorder or randomness. Creationists thus misinterpret the 2nd law to say that things invariably progress from order to disorder. However, they neglect the fact that life is not a closed system. The sun provides more than enough energy to drive things. If a mature tomato plant can have more usable energy than the seed it grew from, why should anyone expect that the next generation of tomatoes can't have more usable energy still? Creationists sometimes try to get around this by claiming that the information carried by living things lets them create order. However, not only is life irrelevant to the 2nd law, but order from disorder is common in nonliving systems, too. Snowflakes, sand dunes, tornadoes, stalactites, graded river beds, and lightning are just a few examples of order coming from disorder in nature; none require an intelligent program to achieve that order. In any nontrivial system with lots of energy flowing through it, you are almost certain to find order arising somewhere in the system. If order from disorder is supposed to violate the 2nd law of thermodynamics, why is it ubiquitous in nature? The thermodynamics argument against evolution displays a misconception about evolution as well as about thermodynamics, since a clear understanding of how evolution works should reveal major flaws in the argument. Evolution says that organisms reproduce with only small changes between generations (after their own kind, so to speak). For example, animals might have appendages which are longer or shorter, thicker or flatter, lighter or darker than their parents. Occasionally, a change might be on the order of having four or six fingers instead of five. Once the differences appear, the theory of evolution calls for differential reproductive success. For example, maybe the animals with longer appendages survive to have more offspring than short-appendaged ones. All of these processes can be observed today. They obviously don't violate any physical laws.
Originally posted by borntowatch
So how does "Life evolve" from nothing
wiki link
Abiogenesis or biopoiesis is the natural process by which life arises from inorganic matter.
Originally posted by Phoenix267
reply to post by borntowatch
Life doesn't evolve from nothing. Evolution is the process of how life changes and adapts to its environment. You're thinking about abiogenesis.wiki link
Abiogenesis or biopoiesis is the natural process by which life arises from inorganic matter.
Another link
Originally posted by jeramie
It's funny how over the years mutations and adaptations have become the two main points for "proving" evolution.
And come on. If a Christian used a Christian equivalent of Bill Nye the Science Guy, they would get laughed out of the forum!
The physical and behavioral changes that make natural selection possible happen at the level of DNA and genes. Such changes are called "mutations." Mutations can be caused by chemical or radiation damage or errors in DNA replication. Mutations can even be deliberately induced in order to adapt to a rapidly changing environment. Most times, mutations are either harmful or neutral but in rare instances, a mutation might prove beneficial to the organism. If so, it will become more prevalent in the next generation and spread throughout the population. In this way, natural selection guides the evolutionary process, preserving and adding up the beneficial mutations and rejecting the bad ones.
Originally posted by micmerci
What your reply is demonstrating is adaptations and mutations which are microevolution at best. This does not account for species changes across generations. Dogs are still dogs.
Abiogenesis fits into the debate because it sets a precedent, not because creationists do not understand scientific terms.
OP, I do appreciate your civility throughout this thread. If others could follow your example, maybe the debate would not degrade to pettiness.
Dogs are still dogs.