Answer:
idk which letter to put bc it mixed up but the answer is either "a willfull change to the envirement" or "adaptions because of a naural selection
Step-by-step explanation:
im pretty sure it is " a willfull change to the envirement" because the evidece that supports this answer includes
-weather became drier and hotter.
-ecosystem recieves far less rain then it used to
-plants with structures helped conserve water, and became more prevalent than plants that did not have those structures.