The Tethys sea was a shallow sea that existed during the early Mesozoic Era . It was the body of water that separated the landmass of Laurasia in the north from Gondwanaland in the south. A theory is a proposed explanation for a phenomenon. For example, the tendrils of vines are thigmotropic. A thorn is a sharp, modified stem.
Thorns have a stem-like vascular structure.
The honey locust plant has thorns. A tipiti is a flexible braided cylindrical basket made of jacitara palm bark that is used by the Tupis of South America. The tipiti is used to remove the poison liquid from bitter cassava root. The cassava pulp is squeezed in the tipiti until the poisonous liquid is extracted. This process makes the cassava edible.