Let's Compare Mucosa and Serosa. 1  MUCOSA VS.  Mucosa. The mucous membranes (or mucosae or mucosas; singular mucosa) are linings of mostly endodermal origin, covered in epithelium, which are involved in absorption and secretion. mucosa \mucosa\ n.
Definition of dropper for English Language Learners. : a glass or plastic tube that is used to measure out liquids by drops.
Answer Wiki. Dropshipping is a method in which you as the seller do not keep the products in your inventory, instead you work with a supplier who sends the products directly to your buyers. Your profit comes from the price difference between the payment you receive from the buyer and the amount you paid to your supplier. An example: