So here's the thing. Amoeba move towards 'shadows' when light shines on them. How are they detecting this light? And why does this cause them to move to the shadows.
Hmm...interesting its a lifeform it contains h2o molecules and it needs to stay hydrated. We move away from the sun when its hot and we are water based so it would be completely logical for another life form with about a trillionth of the water mass of a human being to make even a greater effort to stay hydrated. It would be way easier for an amoeba to dry out than a human so maybe the light is burning them leading to possible pain and dehydration they are alive they must move when in pain or discomfort just because they don't have a nervous system we still cant assume they don't feel pain get hot are get dehydrated.Probably just simple biochemical processes that are impacted by light energy. The whole organism might be 'sped up' by the simple fact of slight heating from light. Hence, it seems to move deliberately away from light.