Primary consumers Organisms that eat producers to obtain nutrients and energy Dallas County Community College BIO 1409 - Summer 2015 1 BioLab3 Ecology Concepts Lab report I. Producers Define the following terms.
Invoice - What is an invoice? Definition: a document sent to a buyer that specifies the amount and cost of products or services that have been provided by a seller. An invoice indicates what must be paid by the buyer according to the payment terms of the seller. Payment terms usually specify the period of time that a buyer has to send payment to the seller for the goods and/or services that they have purchased. Included in a typical invoice. Sales v. purchase invoice.
Invoice is what one would bill for payment with. Voucher is an internal document or documents the Government uses as the evidence to pay a bill. You might try looking in your agencies finance regualtions, policies, handbooks etc. as I suspect 'voucher will be defined there somewhere.