Reduction of gene flow. However, speciation might also happen in a population with no specific extrinsic barrier to gene flow. Imagine a situation in which a population extends over a broad geographic range, and mating throughout the population is not random.
The Internal Revenue Service places restrictions on how far back you can amend your tax return, regardless of whether you owed tax or received a refund. Filers must use Form 1040X to amend a return and should only file an amendment to report certain changes. You have three years from the due date of the original return or two years from when you paid tax owing to submit an amended return. A pen next to an income tax form.
One of the most common questions around tax refunds is how far back can a claim be made with HMRC, (formerly Inland Revenue), when making a claim. The time frame around claiming tax back used to be up to 6 years, however HMRC have now changed this to just 4 years. This year (2011) you can make a claim and if eligible receive a tax rebate for tax years 2010/11, 2009/10, 2008/09 and 2006/7. You would not be able to reclaim any overpaid taxes for any period before 5th April 2007. Interestingly HMRC can still go back up to 6 years or even up to 20 years, if you have not paid enough tax! Contact us