Comments on: How Grizzlies Evolved into Polar Bears

By: khezi - november 21th, 2009 @ 346pm

khezi - november 21th, 2009 @ 346pm — Sat, 21 Nov 2009 19:44:19 +0000

wow this is so harsh poor bears whish i could do somethiing

By: dawn

dawn — Tue, 28 Jul 2009 00:21:19 +0000

It is not a speculation they spend years and hard work uncovering this information. They understand the pieces to the puzzle unlike those who speculate they are not doing the research to back up their theories.

By: Laura

Laura — Tue, 21 Jul 2009 13:56:22 +0000

I agree with Pat Dolan that the language is confusing. The above description sounds more like a
demonstration of Larmarck’s evolutionary theory of inheritance of acquired traits than like Darwin’s
theory involving survival of those members of the species with traits best suited to live in a particular environment. The language used implies that a species or individual may react to new conditions by creating structure that meet a need. It would follow that these acquired traits could then be passed on to offspring.

By: York

York — Tue, 14 Jul 2009 14:37:07 +0000

Every living thing on the earth changes after years, even humans. The reason why we change is so that we can survive better or adapt.

By: Matt

Matt — Mon, 06 Jul 2009 22:07:30 +0000

Kurtz-

You’re not nearly as insightful as you perceive. Your notion that change in the biosphere, such as evolution, extinction, etc., are inevitable is obviously true, but your suggestion that humans have not 1) physically altered every component of the biosphere, which includes the atmosphere, and 2) increased the rates of species extinctions is simply absurd.

By: Michael

Michael — Thu, 26 Mar 2009 15:15:59 +0000

BTW, adaption and evolution via species variation is a well known concept. Brown bears have a great deal of variation in hair color etc. With intense pressure of selection on a small population of animals you can see very rapid changes in a relatively short period of time.

One particular finch on the Galopolus Islands was greatly diminished in population by the recent arrival of another species of Finch with a larger beak. The larger beaked animal was able to eat certain berries better than the one with a smaller one. The population of the larger one exploded too much resulting in fierce competition for the larger berries which became much less common. This forced a great reduction in the larger beaked population of birds allowing the smaller beaked Finch to flourish again. It had adapted to other sources of food from diverse sources as a result of the initial pressures from the larger beaked bird. This happened since the time of Darwin’s expedition and actually really very recently.

A related principle applies to the emregence of antibiotic resistant bacteria over a short period of time. Evolution is not always something that happens slowly over millions of years. It can be quick.

By: Michael

Michael — Thu, 26 Mar 2009 14:57:38 +0000

Thedentition of polar bears has evolved smoothly from brown bears to U. maritimus tyrannus, the first polar bear, to the present day dentition of modern polar bears. These changes are consistent with the evolution of many species over the millions of years life has been present. It’s not a new concept Pat
Dolan. And a simple google search on the evolution of polar bears will lead anyone to many papers confirming the relationship of brown bears and polar bears. Unless of course you can’t read or wish to revel in your own opinions despite the facts.

By: agnes loves mikey's french accent

agnes loves mikey's french accent — Thu, 05 Mar 2009 05:32:11 +0000

lolll. you guys are ridonculous.
i love yer french accent mikey [:

By: look in front of you

look in front of you — Wed, 04 Mar 2009 20:30:15 +0000

hello agnes

By: Annie

Annie — Wed, 04 Mar 2009 20:26:14 +0000

awwwww poor babiess.