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.
When you're expecting a tax refund, the last thing you want to do is wait for it to show up. Fortunately, the turnaround time for tax return processing has sped up tremendously over the years, especially since the introduction of the IRS electronic filing, or e-file, system.mending your tax return. If you need to make changes to your tax return after you've filed, you'll need to prepare an amended return. Amended returns are ineligible for e-filing and must be mailed to the IRS. Processing for an amendment takes an estimated eight to 12 weeks from the date the IRS receives the return.