Linoleic acid is an omega-6 fatty acid because it has a double bond six carbons away from the omega carbon. Linoleic acid plays an important role in lowering cholesterol levels. Alpha-linolenic acid is an omega-3 fatty acid because it has a double bond three carbons away from the omega carbon.
A federal estate tax return (form 706) must be filed by the executor for the estate of every U.S. citizen or resident whose gross estate, plus adjusted taxable gifts is more than $3,500,000. THE FEDERAL ESTATE TAX SAGA 2010 AND BEYOND. The federal estate tax was repealed for 2010.
If the deceased person was married, the surviving spouse can file and sign the return. An estate executor or a personal representative, who is often a relative of the deceased, can also sign the tax return. So can an attorney, or any other person who's primarily responsible for handling the deceased's financial affairs. See page 4 of this IRS link: https://www.irs.gov/pub/irs-pdf/p559.pdf.