It looks like a double helix
Answer:
Absolute refractory period
Explanation:
The absolute refractory period is short in an action potential. During the refractory period, there is no occurrence of another action potential. There would occur two types of refractory periods
Absolute refractory periods: Absolute period is the period when another action potential won't occur immediately after a first action potential. This refractory period also called an effective refractory period. This period happened because the sodium channel is inactivated and is stable in the same way until the hyper polarization does not occur.
Relative refractory period:
It is called "demand characteristic".
In experiments, especially in the subject of psychology, demand characteristics alludes to an experimental artifact where members shape an elucidation of the test's motivation and consciously or subconsciously change their conduct to fit that understanding. This influences information since members begin considering causal, gullible connections, and they endeavor to make sense of it this influences study’s end data.
I think the question here asks for Canada and US: those two countries are know to be popular immigrant choices.
Also, while Greenland is part of Northern America, it has been closer associated with Europe, and it's rarely actually called a "northern American country"
