Which evidence from the sea floor shows that tectonic plates move ? a) The sea floor is much older than any of the continents. b) The sea floor is youngest near a mid-ocean ridge and older farther away. c) Mid-Ocean ridges circle Eqarth like seams in a baseball d) The sea floor is thinner than continental crust.
The trachea, colloquially called the windpipe, is a tube that connects the pharynx and larynx to the lungs, allowing the passage of air, and so is present in almost all air-breathing animals with lungs.he trachea is lined with a layer of pseudostratified columnar epithelium, a type of epithelium. The epithelium contains goblet cells, which are glandular, modified simple columnar epithelial cells that produce mucins, the main component of mucus. Mucus helps to moisten and protect the airways.
Four layers of tissues make up the walls of the trachea: 1  The mucosa is the innermost layer and consists of ciliated pseudostratified columnar epithelium with many goblet cells. 2  Deep to the mucosa is the submucosa layer, which is made of areolar connective tissue containing blood vessels and nervous tissue.