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In evolutionary biology, convergent evolution is the process whereby organisms not closely related (not monophyletic), independently evolve similar traits as a result of having to adapt to similar environments or ecological niches.
ballistic panspermia With the discovery of meteorites on Earth which almost certainly came from the Moon and Mars, it has become relevant to ask whether prebiotic chemicals and even primitive life have been routinely transported between different worlds of this and other planetary systems. The significance of certain features and substances found within the SNC meteorite, ALH 84001, remain a matter of debate (see martian "fossils" controversy). However, it is clear that if rocks from other worlds have arrived here, then the possibility exists of terrestrial material having been transported elsewhere. As Wallis and Wickramasinghe say in a 1995 paper:1 The mass of escaping ejecta from the presumed 10-km object that caused the 180-km Chicxulub crater ... amounted to ~300 Mm3, of which one third may have been rock and 10% higher-speed ejecta that could have transited directly to Mars... The survival and replication of microorganisms once they are released at destination would depend on the local conditions that prevail. Although viability on the present-day martian surface is problematical, Earth-to-Mars transfers of life were feasible during an earlier 'wet' phase of the planet, prior to 3.5 Ga ago. The martian atmosphere was also denser at that epoch ... thus serving to decelerate meteorites, as on the present-day Earth. Since the reverse transfer can occur in a similar manner, early life evolution of the two planets may well have been linked. Exchange of material between the Earth and Mars would have been especially common during the first 800 million years of the Solar System's existence, that is, between 4.6 and 3.8 billion years ago (see Earth, early history), when major impacts with asteroids and comets were frequent. If simple organisms arose on either world during this time – and there is tentative evidence of terrestrial microbial life dating back 3.85 billion years – they may have been transferred inside ejected rocks to the neighboring planet and formed a colony on arrival (see cosmic collisions, biological effects). There are even plausible reasons to suspect that life may have evolved first on Mars and then, via ballistic panspermia, spread to the Earth (see Mars, life). Or, there may have been a regular cross-fertilization of microorganisms between the two worlds. Conceivably, Venus, too, was involved in the transference of life when its surface conditions were more clement than they are today. One consequence of the possibility of such cross-fertilization is that if life, or evidence of past life, were found on Mars, it would not immediately imply independent biological evolution
.Wallis, M. K., and Wickramasinghe, C. R. "Role of Major Terrestrial Cratering Events in Dispersing Life in the Solar System," Earth and Planetary Science Letters, 130, 69 (1995).
Do you have to drag out the obscenities and get so nasty?
If there is life on other planets it is already theorized many of those species would also be bi-pedal humanoids.
And it is already widely accepted organic life here came from microbes in meteors and asteroids from other planets. Transpermia.
Try to keep up...something besides the old blood pressure!
Most of the scientists and astrophysicists seem to indicate it's extremely unlikely that intelligent life on other planets would come in the form of a bipedal hominid.
Originally posted by rusethorcain
reply to post by traditionaldrummer
Convergent evolution www.sciencedaily.com...
In evolutionary biology, convergent evolution is the process whereby organisms not closely related (not monophyletic), independently evolve similar traits as a result of having to adapt to similar environments or ecological niches.
[edit on 20-7-2010 by rusethorcain]
Originally posted by rusethorcain
Convergent evolution
ballistic panspermia
Originally posted by sirnex
Hell, there is no logical reason to assume that an intelligent species *must* be bipedal or look similar to the primate species of Earth!
Originally posted by sirnex
reply to post by traditionaldrummer
Most of the scientists and astrophysicists seem to indicate it's extremely unlikely that intelligent life on other planets would come in the form of a bipedal hominid.
If I'm remembering correctly, didn't they recalculate the drake equation and determined at most there would only be two intelligent species in this galaxy, us being one of them (although I would argue against that )?
Hell, there is no logical reason to assume that an intelligent species *must* be bipedal or look similar to the primate species of Earth! Stupid uneducated narcissists!
Stupid uneducated narcissists!
A psychosis based in uncontrolled narcissism, inflated arrogance and a perceived need to subjugate and/or ridicule other individuals deemed to be inferior or unworthy.
Originally posted by traditionaldrummer
Definitely not and in fact, even on this planet bipedalism is relatively rare.
When people cite humanoid aliens it's simply another example of men inventing gods in their own image; humans once again anthropomorphizing the universe.
A video for "monkeys" I enjoyed it a lot. I hope you will too. Sometimes we have to "think" very hard about our origins, which we always already. Of course, it is a right question to ask "in what sense it will help me to accept that i am a monkey?" Yes, we have to go further, we are creating a new reality, but sometimes we just don't forget that we are nothing but fraking MONKEYS. www.dailymotion.com...
Gangs of chimpanzees kill individuals from neighbouring groups in order to expand their territory and seize new food resources, according to a new study of the animals' notoriously aggressive behaviour in the wild.
It turns out that humans aren't the only animals that occasionally need a little help in the bedroom. According to the New York Times, researchers have discovered wild chimpanzees spicing up their love lives by creating sex toys. That's right: sex toys.
Chimpanzees in Senegal have been observed making and using wooden spears to hunt other primates, according to a study in the journal Current Biology. Researchers documented 22 cases of chimps fashioning tools to jab at smaller primates sheltering in cavities of hollow branches or tree trunks.
Six adult female chimpanzees were shown video scenes of chimpanzees repeatedly yawning or of chimpanzees showing open-mouth facial expressions that were not yawns. Two out of the six females showed significantly higher frequencies of yawning in response to yawn videos; no chimpanzees showed the inverse. Three infant chimpanzees that accompanied their mothers did not yawn at all. These data are highly reminiscent of the contagious yawning effects reported for humans. Contagious yawning is thought to be based on the capacity for empathy. Contagious yawning in chimpanzees provides further evidence that these apes may possess advanced self-awareness and empathic abilities.
www.mnn.com...
A decade of vicious, internecine battles between chimps has been documented in a new paper in Current Biology. Twenty-one chimps were killed or fatally wounded in Kibale National Park, Uganda, over this time period by a group of male chimps from a large community in a region of the park called Ngogo. As many as 13 of the victims may have belonged to a single neighbouring group, representing an extremely high rate of mortality due to intergroup violence, exceeding median rates of mortality due to intergroup violence reported for humans in agricultural and hunter-gatherer populations and compared to the median rate suffered by individuals in 9 well-studied chimp communities. The motive appears to be territory. John Mitani from the University of Michigan in Ann Arbor and his colleagues spent 10 years observing the 150 Ngogo chimps. They even watched 18 of the killings (the other three were inferred from carcasses and faeces containing chimp remains). Most of the time, male chimps behave like rowdy, loud frat boys, but once every 10 to 14 days, they act like cooperative adults and wage war.
Chimpanzees were previously thought to process death in a detached, animalistic fashion. But new evidence shows the animals mourn death much like humans do, revealing an awareness of death that is much more developed than previously thought. Discovery News reports on two recently published studies showing the details of how chimps process the death of companions and offspring.
The real challenge then will be finding the changes that played a major role in the evolution of chimps and humans since the two lineages split, [5 - 8] million years ago. Nothing obvious has leapt out of the initial analysis. “From this study, there’s no silver bullet of what makes chimps chimps and humans humans,” says Evan Eichler of the University of Washington at Seattle.
A preliminary examination of these changes has revealed that, confusingly, most of the changes between humans and chimps seem to affect genes unrelated to language, intelligence, or any of the special things that we associate with humanity. Rather, most of the changes involve genes affecting our immune and reproductive systems. This actually makes sense, some researchers say, because these are among the fastest-evolving parts of the genome in many animals. Immune systems evolve rapidly because of evolutionary arms races between animals and the pathogens that attack them. The two sexes also undergo arms races of a sort in sexual organisms, leading to speedy reproductive system evolution.
This states a good case for the chimp origin.
Chimpanzees 'launch murderous sprees to expand their territories'
Gangs of chimpanzees kill individuals from neighbouring groups in order to expand their territory and seize new food resources, according to a new study of the animals' notoriously aggressive behaviour in the wild.
Chimpanzees found making sex toys
It turns out that humans aren't the only animals that occasionally need a little help in the bedroom. According to the New York Times, researchers have discovered wild chimpanzees spicing up their love lives by creating sex toys. That's right: sex toys.
Originally posted by sirnex
reply to post by deccal
We're not monkey's at all, we're a member of the great apes along with Chimpanzees and Gorillas. Christ... why can't people get it right? If you don't have a tail, your not a damn monkey.