A same meaning or not problem:
This is due to the reduction of excitatory synaptic transmission in a nucleus and the increased excitability in the motor neurons caused by nicotine activation .
This is due to the reduction of nicotine transmission in a nucleus and increased excitability in the motor neurons caused by an excitatory synaptic activation .
****
[A]: no

A same meaning or not problem:
Groups of eastern lowland gorillas are usually larger than those of the western gorillas .
Groups of western lowland gorillas are usually larger than those of eastern gorillas .
****
[A]: no

A same meaning or not problem:
The two main water systems are the Guayas in the North and the Esmeraldas River in the South .
The two main water systems are the Esmeraldas River in the north and the Guayas to the south .
****
[A]: no

A same meaning or not problem:
Scott Stringer received more than 40,000 votes but finished second to Popik , who received more than 200,000 votes .
Popik received more than 40,000 votes , but became second to Scott Stringer , who received more than 200,000 votes .
****
[A]:
no