How did parasitism "evovle"?

take for example, orchids. how could they evolve to depend completely on trees?





what about some species of round worms? they must go through up to 5 different host species through their life time to reproduce. how could it be possible that it evovlved that way?

How did parasitism %26quot;evovle%26quot;?
%26quot;EVOVLE%26quot;?








*snicker*





Oh, you are just priceless, Peanut!
Reply:Begs the question what sort of God has that much time on has hands...... and why ?? More likely a random set of weird stuff end result = orchid.
Reply:how come you%26#039;re not asking this quesiton in biology section?








you are not asking about religion, dear, parasitism, orchids, worms - they are all about biology and if you really want an answer you should be asking this question in the biology section
Reply:there are a number of orchid species that do not completely depend on trees... with time some of them found it was a successful way to go and they proliferated in this fashion.


as to the round worm issue you should consider organisms such as the tape worm Bothriocephalus that require but one host. With time (and of course 5,000 years is not a limit for evolution) one could easily see a gradual integration of many species into its life cycle. Leading to more complex tapeworm life cycles such as Diphyllobothrium.
Reply:Read any decent book on evolutionary biology, why ask in the R%26amp;S section?
Reply:If I had known you as a young person in school , you would now know the answer to such basic simple biology. If you have missed out on this vital education, it is still possible to learn , as the vast majority already have.
Reply:A better question would be %26quot;How could parasitism not evolve?%26quot;





That%26#039;s one for which there is no answer.





Life will always evolve to take advantage of food that is easily obtained.
Reply:Slowly. The bottom line is that practically any viable ecological niche will eventually be tried out.





Consider flowers and bees (symbiosis is much nicer than parasitism). Neither came first, of course. If insects began landing on air-pollinated plants, and carried the pollen to other plants of that species, any plant that produced, say, a spot of moisture for the insects to drink would rapidly clean up in the reproduction war.





In fact *anything* that attracted insects by any mechanism would get this benefit. Some orchids look like female wasps, which makes male wasps try to hump them - picking up pollen in the process.





Isn%26#039;t it easy to see how the tiniest mutation by a plant, if it increased even minutely the chance of an insect landing on it and picking up pollen, would spread like crazy?





Parasites, including microorganisms, start by eating another creature%26#039;s meat. Their supercomplex reproductive cycles come later, developing on previous working systems. Always remember the huge gulfs of time involved in each step. And the fact that evolution makes no sudden jumps: it%26#039;s always a slow accumulation of tiny beneficial changes.





CD
Reply:Stop trying,
Reply:Oh ****...





Orchids didn%26#039;t always depend on trees. However as trees were the easiest source of life for them, their abilities to depend upon other life forms or get by alone atrophied.





Same with round worms.





If you want to know how evolution happened, honey, read a textbook... you%26#039;ll convert no-one here...
Reply:as all other organisms, very very slowly over a long period of time.





i have another interesting question for you. Where did the plants that souly depend on trainsrushing by as a means of dispersing their seeds? trains have only been around for 200ish years?





i suppose if you realy want an answer of anyone who has any idea, you might want to ask this question again, in science %26amp; mathematics %26gt; biology
Reply:If you were genuinely interested in finding out, you could.





You could do some Internet searches, or browse in some quality bookstores in books about evolution until you found one that was accessible to you and addressed this question (as well as others).





This isn%26#039;t something I%26#039;m clear enough on to explain, and, frankly, I%26#039;ve wasted a LOT of my time answering these sorts of questions, just to find out the person DIDN%26#039;T want to understand anything; they were just Finishing Off the Atheists Once and For All -- which you%26#039;ll never do if you aren%26#039;t willing to understand it first.





If you don%26#039;t really want to understand, why should I waste my time trying to explain?





It%26#039;s hard to appreciate the amounts of time involved, and how all of this works -- a tiny change in genes can often have a big-looking effect in the organism, for instance.





Anyway, find some real sources; if you then need help understanding we might be able to help you.





If you were willing to understand, we%26#039;d be HAPPY to help you.
Reply:Go back to school and learn to spell. Thats the first step.