2007-02-06 05:30:13 · 9 answers · asked by Sled Queen 3 in Science & Mathematics ➔ Biology
Pesticides not working anymore.
Every time pesticides have to be made stronger to kill of a certain infestation of bugs or whatnot, it means that that species has evolved to be able to withstand the effects of the initial pesticide.
The aviary flu is another good example. Any disease with no cure really.
Even the common cold. It evolves all the time, thats why we keep catching colds. The virus changes every time we catch it.
2007-02-06 05:35:23 · answer #1 · answered by Michael Dino C 4 · 0⤊ 0⤋
A great example are antibiotic resistant bacteria. Antibiotics were discovered in the 1930's, and put into use in the 1940's. The use of antibiotics has directly led to resistant bacterial strains. At the advent of antibiotic use there were no resistant strains, by the 80's 0.1% of strains found in hospitals were ab resistant, by this decade that number had leapt to 6.6%.
Under the selection pressure of antibiotics there is a significant advantage to having resistance genes. As such, individual bacteria that mutated or acquired resistance genes become more successful than their competitors, reproduce faster, and make up larger segments of the population.
2007-02-06 16:01:01 · answer #2 · answered by floundering penguins 5 · 0⤊ 0⤋
All organisms are undergoing evolution. It doesn't mean that evolution occurs only when there is a morphological change.
The products of evolution can be observed after hundreds of years.
For example: If a plant becomes resistant to a particular type of disease, that plant have evolved to be resistant to that type of disease.
2007-02-06 13:36:27 · answer #3 · answered by caribbeanbluesky 2 · 0⤊ 1⤋
They don't necessarily pop out overnight. It is going on all around us though.
For example, a species of mouse was found on Cyprus recently. A new species of deer in Indo-China. New to science, or newly evolved?
2007-02-06 13:35:39 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Influenza is in the news a lot and is a fine example of an organism evolving.
2007-02-06 13:34:37 · answer #5 · answered by gebobs 6 · 0⤊ 0⤋
Yes. Elephants in Africa.
Poachers and hunters shot the ones with the largest tusks.
The remaining population of African elephants now have smaller tusks than historically.
2007-02-06 13:39:35 · answer #6 · answered by Anonymous · 0⤊ 0⤋
My favorite:
http://www.pbs.org/wgbh/evolution/library/05/2/l_052_05.html
2007-02-06 16:49:30 · answer #7 · answered by Take it from Toby 7 · 0⤊ 0⤋
In every generation of humans, the pinky toe gradually gets smaller and smaller.
2007-02-06 13:38:20 · answer #8 · answered by dahighii 2 · 0⤊ 1⤋
Humans (larger heads, smaller jaws)
Grass, insects (more resistant to heat and pollution)
Just about any living species, if it is stressed in its environment, is evolving.
2007-02-06 13:36:53 · answer #9 · answered by morningfoxnorth 6 · 0⤊ 1⤋