Phospholipids are generally produced from the phosphatidate core structure with a polar head modifying group such as choline. However, a phospholipid called sphingomyelin (see below) is found abundantly in brain and fast neurons. Circle and label all structural features of sphingomyelin which are different from lecithin. 
Definitions:
Total Taxes
The cumulative amount of taxes paid by an individual or company to federal, state, and local governments.
Average Tax Rate
The ratio of the sum of taxes paid to the overall income, determined by dividing the total taxes paid by the total income.
Total Income
The sum of all earnings and revenues received by an individual or business, including wages, salaries, investment income, and revenue from sales or services.
Total Taxes
The aggregate amount of taxes paid by an individual, corporation, or other entity to governmental authorities within a specified period.
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