===Terminal bronchioles=== The terminal bronchiole is the most distal segment of the conducting zone. It branches off the lesser bronchioles. Each of the terminal bronchioles divides to form respiratory bronchioles which contain a small number of alveoli. Terminal bronchioles are lined with simple cuboidal epithelium containing club cells.
Ecotourism in Costa Rica. Ecotourism in Costa Rica is one of the key activities of the tourism industry in the country. By the early 1990s, Costa Rica became known as the poster child of ecotourism. The country is among many developing nations that look to ecotourism as a way of cashing in on the growing demand for this popular trend of travel.
Costa Rica is known for its progressive environmental policies, being the only country to meet all five criteria established to measure environmental sustainability. It was ranked fifth in the world, and first in the Americas, in the 2012 Environmental Performance Index.osta Rica also borders Nicaragua to the north (309 km or 192 mi of border) and Panama to the south-southeast (330 km or 210 mi of border). In total, Costa Rica comprises 51,100 square kilometres (19,700 sq mi) plus 589 square kilometres (227 sq mi) of territorial waters.