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.
Diphtheria usually involves the upper mouth and throat, but the trachea may also be attacked. A false membrane composed of white blood cells and fibrin (clotting protein) coat the surface of the trachea. Typhoid causes swelling and ulceration in the lymph tissue. It can occasionally ulcerate the cartilage of the trachea and destroy tissue. In smallpox, pustules and ulcers, like those on the external skin, form in the mucous membrane.