They aren't directed by a "director". They are directed by natural processes, in the same way that water flowing down a riverbed is directed by the ever-changing outline of that riverbed.
No.
No.
Yes. A program that preceded them in life by their ancestors and which they were lucky enough to carry. It's the same reason why men's beards grow faster in the winter and/or when they spend more time outdoors.
Yes. (although it's not an individual which changes - it's populations after generations and generations of adaptation, each passing on their gene frequencies.)
No.
Not always beneficial at all. That's why there are millions upon millions of extinct species. Their changes were not beneficial or their populations didn't change fast enough to keep up with environmental conditions. There are more dead things than there will ever be living things.
You're alive aren't you? Those odds are pretty damn good.
Because not all creatures needed that particular adaptation. Giraffes have long necks because they were the one species to develop that adaptation... obviously.
There have been other organisms which developed a similar adaption, but they're all gone...
Meet the Okapi
It's the only non-extinct relative of the Giraffe.
Okapi - Wikipedia, the free encyclopedia
And where are the intermediate species?
Meet the Sivathere:
Down on Earth and up in the Sky in the Karoo | ELF Astronomy
Meet the Samotherium
Samotherium - Wikipedia, the free encyclopedia
There's a lot that you don't know...
Natural Selection