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.
However, if the results of the audit show that you owe more taxes, there are limits on how far back the IRS can collect â¦the taxes. Generally, taxes cannot be collected three years after you file a return. If you understated your income by 25% or more, then the limit is six years.