The Gulf Coast Prairies and Marshes ecoregion is found along the southeast coast of Texas and consists primarily of flat plains with low elevations (less than 150 ft). The Gulf Coast Prairies and Marshes region is a nearly level, slowly drained plain less than
150 feet in elevation, dissected by streams and rivers flowing into the Gulf of Mexico. Erosion and deposition in this ecoregion is
the result of ALL BUT ONE of the following event. That is
A)
hurricanes.
B)
wave action
e
human interaction
D)
chemical weathering

The correct answer is C. They are found on the end of bronchioles.

Explanation:

Alveoli are the sac-like structures that are formed by the terminal bronchioles so alveoli are the terminal structures through which many air sacs are raised called alveoli which helps in the transport and exchange of CO₂ and O₂ between lungs and blood.

Blood capillaries surround each alveolus and carbon dioxide moves from blood present in these capillaries to alveoli because the partial pressure of carbon dioxide is higher in blood capillaries than in alveoli and oxygen moves from alveoli to blood because the partial pressure of oxygen is higher in alveoli than blood.

Therefore the correct answer is C. They are found on the end of bronchioles.