Dictionary » E » Extinction

Extinction

Extinction

1. (Science: ecology) The death of an entire species.

2. (Science: psychology) The procedure of presenting the conditioned stimulus without reinforcement to an organism previously conditioned. It refers also to the diminution of a conditioned response resulting from this procedure.


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Microevolution verus Macroevolution

... between humans and chimpanzees, which is to say that humans and chimps carry exactly the same version of the gene. Another useful example is extinction, in which the frequency of all alleles in a species go from some to none. What the creationist is actually talking about here is something ...

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by hackenslash
Thu Mar 06, 2014 8:57 am
 
Forum: Evolution
Topic: Microevolution verus Macroevolution
Replies: 16
Views: 21690

Re: Is complexity inevitable?

... species that can pollinate it. If the insect becomes extinct, so will the flower. If the plant can accept various insects though, its risk of extinction is reduced. A system with one plant and one pollinator is clearly less complex than a system with several possible pollinators. — — I will ...

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by wildfunguy
Thu Sep 26, 2013 6:12 pm
 
Forum: Evolution
Topic: Is complexity inevitable?
Replies: 16
Views: 10690

Why must we avert the genome of Eden?

... An ordinary sexually reproducing organism has to find a fertile individual from the opposite gender to reproduce. This condition has led to the extinction of many species, that otherwise should not have gone extinct. For decades the redeeming evolutionary excuse for sexual reproduction was that ...

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by Hunor
Mon Sep 23, 2013 12:08 am
 
Forum: Evolution
Topic: Why must we avert the genome of Eden?
Replies: 6
Views: 8022

Re:

... of the complexity of the entire ecosystem. However, a specialized pollinator would need to be complex enough to be able to adapt, after a possible extinction of the plant and vice versa.

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by cakrit
Fri Aug 30, 2013 2:38 pm
 
Forum: Evolution
Topic: Is complexity inevitable?
Replies: 16
Views: 10690

Does the thylacine still live?

... Do you believe the thylacine still lives in Tasmania or the Australian mainland? Or have we lost this animal to extinction?

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by AustinWanders
Thu Aug 29, 2013 11:25 pm
 
Forum: Zoology Discussion
Topic: Does the thylacine still live?
Replies: 4
Views: 2525
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