Answer:
D
Explanation:
A, B, and C, are all observing the situations, while D states the deer walked down the path earlier because of the tracks, this is hardly obersavable, and you would have to infere the deer took the path early.
I think genetic variation, but i'm not completely sure
It is called a contusion. Hope this helps.
Answer:
higher altitudes have a lower level of oxygen which in turn, trains your lungs to hold and breathe more oxygen which also helps you cycle, run, etc. longer than usual
Explanation:
Parenchyma cells synthesize and store organic products.
