The Barbarian
Crabby Old White Guy
- Apr 3, 2003
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Evolution
Definition
noun, plural: evolutions
(1) The change in genetic composition of a population over successive generations, which may be caused by natural selection, inbreeding, hybridization, or mutation.
Evolution - Biology-Online Dictionary | Biology-Online Dictionary
No. You're still struggling with the difference between natural selection (which causes much of evolutionary change) and evolution (which is a change in allele frequency in a population over time). There are forms of evolution that are not causes by natural selection. Natural selection is the process by which a population gets more fit over time.
Change in allele frequency in a population over time. That's all it takes.
Don't know any examples in nature where one goes from breathing air to getting oxygen from water. But of course, lungfish are a good example of going from water to breathing air.
Mudskippers, which are fish that spend much of their time on land or climbing small trees, have the ability to breath through tissue in the mouth and pharynx, much as many other completely aquatic fish can do, enlargement of the pharynx is the way lungs evolved in lobed-fin fishes that gave rise to land animals.
So there is that.
Definition
noun, plural: evolutions
(1) The change in genetic composition of a population over successive generations, which may be caused by natural selection, inbreeding, hybridization, or mutation.
Evolution - Biology-Online Dictionary | Biology-Online Dictionary
Ok that technical definition just defines natural selection as that is all those processes listed will produce.
No. You're still struggling with the difference between natural selection (which causes much of evolutionary change) and evolution (which is a change in allele frequency in a population over time). There are forms of evolution that are not causes by natural selection. Natural selection is the process by which a population gets more fit over time.
Please now supply the definition of evolution where a creatures descendents are radicaly different,
Change in allele frequency in a population over time. That's all it takes.
as in a parent bteather air and offspring breath in water.
Don't know any examples in nature where one goes from breathing air to getting oxygen from water. But of course, lungfish are a good example of going from water to breathing air.
Mudskippers, which are fish that spend much of their time on land or climbing small trees, have the ability to breath through tissue in the mouth and pharynx, much as many other completely aquatic fish can do, enlargement of the pharynx is the way lungs evolved in lobed-fin fishes that gave rise to land animals.
So there is that.
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