Tuesday 26 May 2009


Do you find yourself annoyed by them? Do you enjoy some of them? Do you ever click on web adverts? Or do you have some strategy for avoiding them?
Adverts can often provide some much needed income to keep a website going (this isn't just a shameless ask - but if you see an advert that interests you and you click it I do get a (very very) small reward). Do you use tools like Adblock.
Just trying to gauge opinion on whether it is of any use keeping the adds on my site.

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What makes a species a species?
Are dog breeds different species?
There are many definitions of what kind of unit a species is (or should be). A common definition is that of a group of organisms capable of interbreeding and producing fertile offspring, and separated from other such groups with which interbreeding does not (normally) happen. Other definitions may focus on similarity of DNA or morphology. Some species are further subdivided into subspecies, and here also there is no close agreement on the criteria to be used.Wiki

Even closely related populations are normally considered different species if there is some kind of reproductive barrier between them. This could be a genetic barrier - incompatible chromosomes preventing offspring. It could be a physical barrier like a ocean or mountain range.
You could, using artificial insemination, inseminate a Chihuahua with mastiff semen but you might end up with an embryo so large it couldn't be carried to term. A male Chihuahua would not be able to make much progress with a female mastiff without some crampons or other climbing gear. Does this make them different species? Your call

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