Answer:
D. The mammoth became extinct because mammoth physiology changed with the climate.
Explanation:
"ecology of the area developed into extensive forests of birch and conifers" and "not favorable for the mammoth and was difficult to digest." Infers that the mammoth became extinct due to its digestive system rejecting the food that the area provided. It's digestive system required different foods, thus starving them into extinction.
B. Glucose and O2
The products are H2O and CO2
C the answer is C that’s the answer C