mesoderm. in biology, middle layer of tissue formed in the gastrula stage of the developing embryo. At the end of the blastula stage, cells of the embryo are arranged in the form of a hollow ball.
8th Anniversary Gift Ideas. Traditionally, couples give gifts of bronze or pottery to celebrate their 8th wedding anniversary. Bronze is created by combining two different metals, copper and tin, to make something strong and beautiful, just like a marriage brings two people together into something more.
22nd Anniversary Gift Ideas. Celebrate your 22nd anniversary with the beauty and durability of copper. This versatile metal makes a fitting traditional and modern theme for the 22nd wedding anniversary, as it can be used in everything from coins, to jewelry, to cookware and home goods.