No, Ireland and Britain are different countries, you would have to leave the Irish Army, then try to get permission to join the British army
For the same reasons that people all over the world have always emigrated, namely in search of a better life. Ireland was not a rich country in 1833, so people went in search of better lives. Today there are Irish people and people of Irish descent in many parts of the world, because so many people from Ireland have emigrated in the past few centuries.
English and Irish would have been spoken in Ireland in the 1800s. Irish would have been stronger then than it is now.
Something from Ireland would be called Irish.
Ireland is geographically part of the British Isles. So on that basis, there is no answer to the question. What you are referring to is the sea between Ireland and Britain. That is the Irish Sea.
Many Irish people would have moved to Australia and so there would be some Irish music heard in Ireland, but it would be different to Australian music.
People born in the six counties of Northern Ireland are British in international law and their passports would give their status as British Citizens, but they would probably describe themselves as being Irish.
Irish nationalism is only within the province of Ulster in Northern Ireland (part of the UK). A minority of the population want to leave the UK and become part of the Republic of Ireland.
I would think it started in Ireland. But I'm not entirely sure.
Gazelles are not native to Ireland and no Irish zoos or wildlife parks have them, so the answer would be no.
There would be no partition, Irish people would still speak Irish, not English, and Ireland wouldn't have such a colourful history. England's invasion of Ireland has had such an affect on the country, it's hard to say what it would be like if it hadn't happened.
that would depend on if your parents are Irish, though I'd think you'd be an Irish citizen even if your parents weren't