Evolution, Morphology and Exobiology

Hello. I have recently started a microbio culture and today while I was checking up my euglena culture, I took a sample of the surface of the container and found numerous non-euglena nearly transparent organisms (roughly the same size although) swimming throughout. But as I took another sample of deeper water in the container, there was little or none of this unidentified organism. The organisms look like Colpidium Sp. to me but if there are any uni-cellular experts out there that can tag this organism for me that would be excellent. I have included 3 photos of the surface sample at 2 magnifications.

Are his claims bogus?Or is he presenting evidence that can't be disproven?

Imagine you're dining at a restaurant in a city you're visiting for the first -- and, most likely the last -- time. Chances are slim to none that you'll ever see your server again, so if you wanted to shave a few dollars off your tab by not leaving a tip, you could do so. And yet, if you're like most people, you will leave the tip anyway, and not give it another thought. These commonplace acts of generosity -- where no future return is likely -- have long posed a scientific puzzle to evolutionary biologists and economists. In acting generously, the donor incurs a cost to benefit someone else. But choosing to incur a cost with no prospect of a compensating benefit is seen…

what advantages do Agrobacterium confer to plants during infection?

Experts in evolution please answer me. I know that every change in evolution happened because of genetic mutations, therefore by accident. Chimps could develop bigger brains only thanks to a genetic mutation in the size of the skull. But I don't understand why this happened only to primates. Why this mutation didn't happen to a zebra or a lion?

What is Rabbit total classification (in maps of 'living' organisms), if I am to correctly elaborate?

I have been wondering for a long time, since my brother said we were the most efficient, what is the most efficient animal when running in terms of both distance and i forget the term but it's basically number of body lengths traveled.

If I understand the basic premise of the theory of Evolution, it is clear enough to me how over thousands of generations a species will produce millions of variations in the individuals. A long period of time, perhaps 10's of thousands of generations, will yield billions of individuals, each with slight variations. So it is logical and natural to conclude that a particular habitat may favor the survival (to reproduction at least) of those species with variations that best suit their environment. So, again over thousands of generation, it is easy to see that the individuals least suited to the environment may not survive to the reproductive age. The characteristics …

If Mitochondrial Eve is 50,000+ years older than Y-Chromosomal Adam, does that mean he was a polygamist? After all, all humans descend from Y-Chromosomal Adam, but not all people descend from his first wife, right? Hence Mitochondrial Eve being a woman from much earlier. Or am I misunderstanding something?

I ever floor the statement about Dolphin and whale was not a fish but its classified in sea mamals. Many audiences was not believed, they need a proved . I tried my best to prove it but i had shortage with concept and theory and also evolution picture. I need help for some material, and picture that could explain much about dolphin evolution from its ancestor till recent species.

Всем привет, подскажите пож-та где можно скачать Photoshop последней версии с ключом. Всё обычскал. Спасибо

Apparently, the pack rat is not a member of the Rattus genus. It has another, but not able to figure out why. Geez, if it looks like a rat, walks like a rat, squeals like a rat, shouldnt it be a member of the Rattus Genus? (funny, I asked once where does the Norway rat come from......it is not Norway. Guess it actually came from the far east....China??)

My general perception is that children usually mature to be a couple inches taller than their parents. If this would be a constant rate, human height would increase 1-2 feet every 12 generations. Presumably, this rate has increased - otherwise ancient humans would have been the size of rodents. Likewise, it is hard to imagine that average human height will be 10+ feet tall over the next decade or so. So what are are parameters of generational height increase and are we just in a period of history where rapid height increase is due to advances in nutrition and exercise/physical activities that influence growth?

Hi. I'm a new member so if i have completely misunderstood this then please don't laugh at me. I was having a discussion on another forum about the likelihood of life on other planets, and i thought about applying the poisson distribution to workout the highest probability that only 1 planet would have life on it (i.e us). I had to assume the mean was 1 and it came out at 36.7879%. Now this only shows the probability of only 1 planet forming with life, prior to knowing that 1 planet has formed with life, but it would at least show that if we are alone, it is a pretty big coincidence because even having an average designed to make it as unlikely as possible, it is sti…

Montanman I understand that in general a theory describes how something or a system works. Theories may be correct or incorrect. They may accurately reflect the reality or they may simply be ideas and not facts ( unsubstantiated ideas in some cases). Many people think that evolutionary theory is all fact. I do not agree with this. Many of it's ideas are unsubstantiated. For example I have been told ( by Ophiolite here ) that speciation has been observed but I have not yet seen the evidence ( I have some research links on this I am looking at now). There are other evolutionary ideas I am also not sure about. Natural selection as far as I can see works …

there are no such things as a vestigal organs

It seems likely this would have to start with something small and light (insect ?) which could be lifted into the air by a strong wind/breeze and which would develop bud like appendages which later develop into full blown wings in later generations ? The question is , what is the impetus or trigger which causes the immature wing buds to confer some kind of benefit or advantage to the individual so it is more successfull and survives to procreate and so wings get larger, develop and become more and more successful and usefull ? Some animals which have the power of some kind of flight are various insects, pteradactyl/dino etc., birds, gliding animals and fl…

Hey everyone I'm wanting to write a short five page paper on one of the following: The origin of replication The origin of reproduction Horizontal Gene Transfer I was debating whether I should put this in the HW section, but I think this is a more appropriate area. Anyways, I was wondering if you guys could direct me to the names of any peer review journal articles that are a must-read for any of these topics. I'm particularly interested in the origin of replication, because this is the real problem I have with the origin of life. That even if life could occur, it would have to survive long enough to replicate. Like I'm wondering what is the prevailing…

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Dinosaur 'death pose' resembles ancestral, proto-Dinosaur, "maximum effort" posture ??? In the immediate aftermath, of the Permian Mass Extinction c.250 Mya, early 'proto-Dinosaurs', like Euparkeria (south Africa), survived the cauldron of competition, by rearing up, on their hind legs, and, thereby, "reaching high for the sky", to consume flying insects, otherwise unreachable from ground-level (BBC Walking with Monsters DVD): Over many millions of years, Dinosaurs therefore evolved more advanced lungs, hearts, and hips, until the first true Dinosaurs evolved true bipedal postures, c.230 Mya (south America). Now, that feeding posture, of 'proto-D…

There's a new Paradigm that applies across Biology and Cosmology which indicates that there are 37 types of biological organism within five domains comprising one meta-domain of four and one meta-domain of one. Biological evolution occurred twice, with the meta-domain of one becoming extinct. typology

When birds fly with their wings flapping, they go in a smooth straight line. But when they stop flapping, and just glide through the air, the glide seems quite "wobbly". The birds keep tilting and swerving slightly, and give the impression of directional instability. This instability results from lack of a vertical stabilizer, ie, a tail-fin. Tail-fins are fitted by humans to aircraft. And fish have evolved tail-fins. Surely birds could easily evolve a vertical fin. It could be just a sort of stiff planar ruff of feathers on the rear of their bodies. Such a feather-fin would "cost" very little - it would add hardly any weight, and require no radical c…

We're not going to discuss about psychological aspects that contribute in longer lifespan such as stress-free environment, adequate nutrition, health care, social stimulation, living in captivity VS nature, etc. We're going to see things from other fields/point of views. Take this as simple example: A small chihuahua can live far longer than a big St. Bernard since it requires less effort to sustain its heart and other vital organs, etc. A rat that is almost the size of a chihuahua live no more than 2 years. The lifespan of an elephant could be as long as the average lifespan of human. Cold-blooded species could live longer due to decreased metabolic rate …

Dear Sciencepeople, With this study I'm searching for an optimal size for cues of sexual attractiveness in advertisements. Therefore, I have set up a website which allows me to investigate this. This is not a boring questionnaire but a fun and short test where you need to choose between pictures of attractive people. The link below will take you to the website where further instructions will be given. The entire study is based upon the principles of evolutionary psychology and takes about two minutes. At the end of the test you will be able to leave your e-mail address so you can keep track of the results. Don't forget to send this to your friends and family! http…

According to Bray's book Wetware, whilst the sensory Receptor Complex, at the 'head' end of an E.coli cell, is highly structured and ordered, the Flagella molecular motor machines are distributed irregularly around the back and sides of the cell. In images shown, it looks like they 'anti-cluster', or tend to space apart, around the back of the cell. In any event, they are far less structured, than the sensory structure (which detects important chemical constituents, in the environment, through which the cell swims). And more, the propulsion system is functionally simple as well, with only two states -- swim full forward ('go'), and tumble to a stop.. Why, then, would,…