Here is a question that I just came across while reading: Which of the following has the most primitive respiratory system? A. Rat B. Fish C. Toad D. Grasshopper E. Lizard I read thoroughly, with a view of having an answer to the question. Uptill now I have not made any success. Folks in the forum, please let's discuss it with a view of arriving at a correct answer.
Ha-ha-ha!!! Please Register or Log in to view the hidden image! I would think so, too. There's certainly no mystery to THIS one!!
The word primitive is used when one talks or make reference to something that has to do with acient period. Is use to refer to something that happened or done in early history of something. Now that the word (primitive) has come into this context. I don't know the type of respiratory system the first set of animal that elvoved use.
Rats have lungs: http://www.bing.com/images/search?q=rat lungs&qpvt=rat lungs&FORM=IGRE Fish have gills: http://www.bing.com/images/search?q=fish gills&qs=IM&form=QBIR&pq=fish%20gills&sc=8-10&sp=1&sk= Toads have simple lungs: http://www.britannica.com/EBchecked/topic/499513/respiration/66211/Amphibians Grasshoppers have spiracles, etc.: http://entomology.unl.edu/charts/respir.shtml Lizards have lungs: http://www.britannica.com/EBchecked/topic/499513/respiration/66212/Reptiles It is a subjective question, as they are all complex systems that work to varying degrees, with varying limitations. You figure it out, I did most of your homework for you.
Chikis, it's time to tell you something - very plainly and clearly: WE ARE NOT HERE TO PROVIDE YOU WITH ANSWERS TO YOUR HOMEWORK ASSIGNMENTS!!! I will not respond to ANY more of your questions and would ask all the other members to avoid doing so also. Goodbye! :bugeye:
The word "primitive" means "early". Evolution generally progresses from the simple to the complicated. Thus, "primitive" can mean "simple" in the evolutionary sense. What is respiration? According to Wikipedia: Respiration (often confused with breathing) is defined as the transport of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction. If you consider the entirety of the respiratory systems in question (between the atmosphere and the cells), either a clear answer should begin to emerge, or you should at least be able to eliminate a couple of the more complicated systems.
How do you want me to consider it? Maybe I will start by analyzing the methods by which each of the animal in question respire.
I start by analyzing the respective ways each of the animal in question respire. The rat uses it's lung to respire. The fish uses it's gill for respiration in it habitat (water). The toad uses it's skin, mouth and lung to respire. The grasshopper respire by making use of it's spiracle under it (grasshopper) abodmen. The lizard uses the lung. With this few analysis, how I am suppose to know the animal that has the most primitive respiratory system?
How are you supposed to know? You aren't!! You are supposed to use the study materials your school furnished you and FIGURE it out - that's how!! Please - I ask that no one give this little kid the answer to his HOMEWORK question! If you do, you will be cheating him out of his opportunity to learn how to study.
You are getting it wrong. This is not a homework or anything like that. I got this from a past specimen questions and answers. The answer has already been provided in my question and answer booklet but am not sure wether the answer is correct. That's why I have decided to forward the question into the forum for discusion and further scrutiny. Understand that am a secondary school leaver preparing for a future exam. From all my analysis, am choosing grasshopper as the animal that has the most primitive respiratory system based on the fact that it is the lowest in rank. What do I mean by lowest in rank? What I mean is this; all the animal mentioned are vertbrate while grasshopper is not.
It doesn't matter if what you have just said is correct, the situation remains unchanged. Learning and figuring out things is a *never-ending* process. You will still need to know how to do that up until the day you die. As to the specifics of your question at hand, I will tell you this much (and you figure out the rest): Your logic is good but you've taken the wrong track. Think about the full order of evolution.
I don´t know which is most primative but birds have the most advanced - at least twice better than humans, as air only flows one way thru their lungs - fresh air enters one end while to stale, CO2 rich, air leaves the other. They need that for flying as that takes a lot of O2 (and higher body temperature to speed up metabolism). You can never get a lung full of only fresh air and then half the breathing effort & time is spent trying to get a high fraction (but never all) the CO2 rich air out of your lungs. (You are always re-breathing some air that failed to exit.) The "inteligent designer" saved his best efforts for birds and octopi who have better designed eyes (retina is the first, not the last, surface the light strikes. In humans it is behind the network of nerves collecting signals and behind the network of blood vesels and some other layers which block light from reaching the retina. Humans are poor trial attempts, in which either the ID was just learning his craft or perhaps the work of the lesser god, his younger brother, SD, (stupid designer). Please Register or Log in to view the hidden image! More details here: http://people.eku.edu/ritchisong/birdrespiration.html Yes, it is complex. SD, the human designer, did not even understand how it works!
Quote: I don´t know which is most primative but birds have the most advanced.... I think you and I have the same problem of figuring out the animal that possess the most primitive form of respiratory system. The question did not demand for the animal that possess the most advanced form of respiratory system. If it does, the answer would have been more easiar to give. What do you think?
The correct answer is STILL quite simple to figure out! Just do as I told you and look at the normal progression as described in evolution. It's SO easy to spot that a child of 10 should be able to give you the answer without even having to think about for more than a couple of seconds. :shrug:
Darwins's theory of evolution is the widely held notation that all life forms is related and has descended from a common ancestor; the birds and the bananas, the fishes and the flowers. Darwins's general theory presumes the development of life from non-life and stresses a purely naturalistic. Looking at "embroyology", one of the evidence of evolution. The embroyos (the earliest stage of and development of both plants and animals) of fish, reptile, birds and mammals are very similar and this are evidence that they evolved from a distant common ancestor. Embroyology shows that all have gill slits and tails in their embroyos like those of a fish. I can use this theory to pick fish out as the animal that has the most primitive respiratory system. How about that?
Darwins's theory of evolution is the widely held notation that all life forms is related and has descended from a common ancestor; the birds and the bananas, the fishes and the flowers. Darwins's general theory presumes the development of life from non-life and stresses a purely naturalistic. Looking at "embroyology", one of the evidence of evolution. The embroyos (the earliest stage of and development of both plants and animals) of fish, reptile, birds and mammals are very similar and this are evidence that they evolved from a distant common ancestor. Embroyology shows that all have gill slits and tails in their embroyos like those of a fish. I can use this theory to pick fish out as the animal that has the most primitive respiratory system. How about that?
Darwins's theory of evolution is the widely held notation that all life forms is related and has descended from a common ancestor; the birds and the bananas, the fishes and the flowers. Darwins's general theory presumes the development of life from non-life and stresses a purely naturalistic. Looking at "embroyology", one of the evidence of evolution. The embroyos (the earliest stage of and development of both plants and animals) of fish, reptile, birds and mammals are very similar and this are evidence that they evolved from a distant common ancestor. Embroyology shows that all have gill slits and tails in their embroyos like those of a fish. I can use this theory to pick fish out as the animal that has the most primitive respiratory system. How about that?
