Answer:
The correct answer is - relative refractory period.
Explanation:
The relative refractory period is a period that stimulates a secondary response if the stimuli are greater than the normal. It occurs when partial repolarization after a nerve fiber fired.
The relative refractory period is one of the two types of the refractory period which is the relative and absolute refractory period. In the absolute refractory period, it is not possible to activate another action potential in membrane.
Thus, the correct answer is - relative refractory period.
Eukaryotic cells and prokaryotic cells contain a cytoplasm and ribosomes. Eukaryotic cells have organelles and a nucleus.
Prokaryotic cells were most likely to evolve first because of the simple structure.
Answer;
D. Rift valley
Explanation;
-A divergent boundary also called the divergent plate boundary is a linear feature that exists between two tectonic plates that are moving away from each other. Most divergent plate boundaries are underwater (Iceland is an exception) and form submarine mountain ranges called oceanic spreading ridges.
-Divergent boundaries are areas where plates move away from each other, forming either mid-oceanic ridges or rift valleys.They are constructive boundaries. Convergent boundaries on the other hand are areas where plates move toward each other and collide.
C. The sum of all forces on an object in equilibrium is zero. Equilibrium means in a stationary position. Therefore there is no acceleration. And using Newton's second law, we can say that the net or resultant force is 0.
F = ma
=>F = m(0)
=>F= 0
