Answer: The correct answer is (D) Both A and B
Explanation:
When an axon is depolarized at halfway to the threshold level,the action potential will be generated that would travel 'downstream' i.e towards the synapse and 'upstream' i.e back towards the cell body. This is because both channels on either sides are not under refractory period,i.e they are open.
Answer: That is True.
Explanation:
Many studies have attributed the crossover to the “survival of the fittest,” suggesting that difficult conditions faced by African Americans during their younger ages made the weakest ones among cohort to high mortality with only the most strongest reaching old age
Answer:
B. progression
Explanation:
definition of progression:
the process of developing or moving gradually towards a more advanced state.