Well, where you are effects the climate because there are different weather patterns in each region. For example, the mountains get colder in the winter because they have a higher altitude, therefore, geography plays a part.
Answer:
spatial summation
Explanation:
There are two types of neuron summation:
- temporal-multiple repeated signals (target neuron receives a single form one neuron that is repeated)
- spatial-multiple simultaneous signals from multiple synapses (target neuron receives few different inputs).
Since the signals might be excitatory (produce depolarization of the postsynaptic cell) or inhibitory (produce hyperpolarization) of the postsynaptic cell, their total sum might or might not trigger an action potential on neuron.
The earliest hominins probably lived in an extreme kind of environment.
