Which of the labeled structures in the diagram are the vessels where exchange of gases, nutrients and wastes occurs? 
Definitions:
Ordinary Annuity
An annuity in which payments are made at the end of each period, such as monthly or annually.
Monthly Payment
Monthly payment is the amount paid every month over the term of a loan, lease, mortgage, or other financial agreement.
Personal Financial Planning
The process of managing one's finances by setting goals, assessing resources and liabilities, and devising strategies for achieving financial objectives.
Periodic Payment
A payment made at regular intervals, such as monthly or annually, often in relation to a loan or mortgage.
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