"It ls an example of co-option in which a structure's used for one function evolves into another function. The eye is an example, which evolved from a light sensitive spot in primative cells."
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Greg Smith
- Male
- Brandon, FL
- United States
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Jim DePaulo replied to Greg Smith's discussion Lung evolved from Gas Gland? in the group ORIGINS: UNIVERSE, LIFE, HUMANKIND, AND DARWIN
Noh Name replied to Greg Smith's discussion Lung evolved from Gas Gland? in the group ORIGINS: UNIVERSE, LIFE, HUMANKIND, AND DARWIN
"I've seen the anableps at the zoo the other day. Very cool creatures. I thought the pupil was split horizontally in each eye."
Noh Name replied to Greg Smith's discussion Lung evolved from Gas Gland? in the group ORIGINS: UNIVERSE, LIFE, HUMANKIND, AND DARWIN
"I've heard the idea somewhere but can't recall where off hand. It does seem plausible."
Greg Smith replied to Dallas (on hiatus)'s discussion Why are you single? in the group Atheist Singles
"I'm single because after I broke up with my ex a few months ago, I lost my job and it took me a little while to get myself together. I still don't have a job yet, and since I'm looking for one and I'm also in school now, I…"
Louis replied to Greg Smith's discussion Lung evolved from Gas Gland? in the group ORIGINS: UNIVERSE, LIFE, HUMANKIND, AND DARWIN
"I've studied under a zoologist who stated as much. It performs almost the exact same function as a lung so there's a good chance that the lung followed from it.
Given the ad hoc way that virtually every multicellular creature appears to…"
Sarah Walton replied to Greg Smith's discussion Lung evolved from Gas Gland? in the group ORIGINS: UNIVERSE, LIFE, HUMANKIND, AND DARWIN
"I've used my lungs the way I imagine a fish uses its gas gland when I used to scuba dive. Once I achieved neutral buoyancy with my equipment I could take a deep breath in to go up and exhale all the way out to go down. It also seems as if…"
Marc Draco replied to Greg Smith's discussion Lung evolved from Gas Gland? in the group ORIGINS: UNIVERSE, LIFE, HUMANKIND, AND DARWIN
"Sounds plausible - evolution certainly works like that."
Kenneth Montville D.D. replied to Greg Smith's discussion Lung evolved from Gas Gland? in the group ORIGINS: UNIVERSE, LIFE, HUMANKIND, AND DARWIN
"You're absolutely onto something. There are actually a few fish such as gars, bichirs and lungfish who have vascularized gas bladders which work as primitive lungs."
Apeman Jim replied to Greg Smith's discussion Lung evolved from Gas Gland? in the group ORIGINS: UNIVERSE, LIFE, HUMANKIND, AND DARWIN
"That sounds like a pretty decent idea. Its unfortunate that the fossil record makes it difficult to verify transitional states of cells and internal organs. What about lungfish and other partially amphibious critters?"
Greg Smith added a discussion to the group ORIGINS: UNIVERSE, LIFE, HUMANKIND, AND DARWIN
Lung evolved from Gas Gland?
So in Ichtyology class I was learning about the Gas Gland. It's an organ fish use to keep themselves buoyant in water. One type of gas gland extracts Oxygen from capillarries to inflate the gland, and then releases it back into the blood supply to lower it's body in the water. I was thinking that the gas gland was probably what had evolved into the lung and asked my proffessor if that's where it evolved from. He didn't seem to know but thought that it seems like the only thing that the lung…See More
Greg Smith replied to Kelly M's discussion New Hawking "The Grand Design" Who's reading it? What do you think? in the group ORIGINS: UNIVERSE, LIFE, HUMANKIND, AND DARWIN
"I think he actually was saying that we don't have free will. If any of you have read "Beyond Freedom and Dignity" by B.F. Skinner, he pretty much explains how every action is just a reaction to a cause. I haven't actually read…"
Greg Smith joined Dr. Terence Meaden's group
ORIGINS: UNIVERSE, LIFE, HUMANKIND, AND DARWIN
We debate origins of the Universe, life, Earth, humans, religion, atheism, using common sense, evolution, cosmology, geology, archaeology, and other sciences, to repel biblical creationism and other religious beliefs.
Greg Smith replied to Jerome's discussion Did Carl Sagan influence you on the road to atheism? in the group Carl Sagan Fans
"Totally. He taught Bill Nye, who did the T.V. Series "Bill Nye the Science Guy" that I watched as a child and became obsessed with science because of it. I'm guessing the show was inspired by sagans Cosmos to popularize science. I…"
Greg Smith joined Roy The Infidel's group
Trance Atheist
Everything and anything DJ. For lovers of Electronica and its sub-genres: techno, trance, house, DnB, Electro, IDM, dubstep, Big Beat, etc. IN BEAT WE TRUST. (ID0106.10)See More
Greg Smith joined Sara's group
Atheists who love Science!
A group for science enthusiasts of all types -- professionals, amateurs, students, anybody who loves science.
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Comment Wall (6 comments)
- At 12:21am on October 17, 2010,
Brianna Starfish said… - Thanks for the add!
- At 10:04pm on October 12, 2010,
Kelly M said… - One can ALWAYS use good friends of like mind ;)~ I respect the no label thing BTW! Sometimes over the top atheists are just as bad as pentecostal christians! This website is really cool though! I thoroughly enjoy reading the opinions of well informed rational people!!
- At 5:28pm on September 25, 2010, Kelly M said…
- Hi Greg, thanks for the add.
- At 6:25am on September 20, 2010,
Leslie said… - Welcome!
- At 9:11pm on September 19, 2010,
sunshinegirlie said… - Hi Greg :)
- At 9:23am on May 18, 2009,
Dr. Terence Meaden said… - Your stated aims are excellent.
Welcome to Atheist Nexus with its 8000 good friends.
A science-based group you may like is “ORIGINS” (Origins: Universe, Life, Humans, Evolution, Religion..... ) with its 120 discussions and numerous video films.
One discussion (over 65 posts) is "Proud to be Atheist".
There's much to feel good about
because atheists and humanists hold the intellectual and moral high ground that is far removed from the pathetic superstitious god believers who are slaves to a narrow-minded controlling clergy and their imaginary beings.
Terry Meaden (scientist, Oxford)
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