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.
Three years to get a refund. The good news is that you can still get a refund for three years after the original due date of your return. This means that on April 15, 2013, you will still be able to get a refund for 2012 (current year), 2011, 2010, and 2009 taxes. But after this deadline, you wonât be able to get a refund for 2009 taxes anymore.