Answer:
B) Air Resistance
Explanation:
A reaction force is the opposite of an action force, so what is opposing gravity? Momentum certainly isn't in this instance of the apple falling. Thermal velocity isn't, and anti gravity is a hypothetical phenomenon.
Humans have bigger pelvic bones than four legged animals because animals and humans share more than 70% of our DNA with animals so as the animals get smaller, our bones become bigger.
