Do Irish people Scottish people and Welsh people look different too English people?

Is there something that keeps you from using punctuation when you write? Are your punctuation keys broken or something?

Through their DNA, the British Isles originated from Spain. In answer to your question, the differences you distinguish, may be due to certain characteristical changes that can take place-- due to different climatic changes in extremely diverse parts of the world.

Not really. Genetically the Irish are a little bit more homogenous, they had liess incoming groups, but basically the real difference between the groups is more apparent on a cultural scale.Irish people, on average, are somewhat darker haired than the English but, conversely are somewhat more blue eyed.' If you have lived in these countries for years, you might be able to pick out a very 'Irish chin' or 'nose' but this of course ins only in a tiny amount of the population. Most times only the accent is the real giveaway.

I believe you have based your question on an idea that most people are familiar with: that the English are descended from Anglo-Saxons, who invaded eastern England after the Romans left, while most of the people in the rest of the British Isles derive from indigenous Celtic ancestors with a sprinkling of Viking blood around the fringes.

However based on the overall genetic perspective of the people of the British Isles, it seems that Celts, Belgians, Angles, Jutes, Saxons, Vikings and Normans were all immigrant minorities compared with the Basque pioneers, who first ventured into the empty, chilly lands so recently vacated by the great ice sheets.

http://www.prospectmagazine.co.uk/features/mythsofbritishancestry

They are all people from the British Isles and all look very much the same.

I would say so yes.

If by different you mean not different then yes.

No. They're called ACCENTS. That's how you tell.