What does Greenberg mean when he says it's not an unusual human characteristic to reduce the world down to very few elements?

Aneuron is stimulated with an electric pulse. the action potential is detected at a point 3.70 cm down the axon 0.0052 s later.when the action potential is detected 7.20 cm from the point of stimulation, the time required is 0.0063 s. what is the speed of the electric pulse along the axon? (why are two measurements needed instead of only one? )

How would you describe the the organisms in the second row of model 1 that are connected to the parents by a line

The direct energy source that drives atp synthesis during respiratory oxidative phosphorylation is