I would presume the factors would be soil and the sunlight. These two, I observe, are the needed factors for survival of the terrestrial organisms. And help them thrive.
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You need the picture. However, since I'm doing PLATO as well, here's the answer:
The third position in which the cyclist is going downhill is the position where the cyclist has the maximum kinetic energy. The other two photos show that the biker has more potential energy.
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