There is a
transient electro-physiologic dysfunction of the reticular activating system in
the upper midbrain caused by rotation of the cerebral hemispheres on the fixed
brainstem. -The CSF cushions the brain from light trauma in times of more
severe impact, the forces on the brain may be linear, angular, or rotational, in
rotational movement, the head turns around its center of gravity: this is the
primary mechanism causing concussion.
The answer is B) Limiting factors.
Hope this Helps!!
Answer:

Explanation:
Given -
Total Population - 
Individuals with homozygous HbA/hbA genotype - 
Individuals with homozygous hbs/hbs genotype -
Individuals with heterozygous hba/hbs genotype - 
Let us assume the given population is in Hardy Weinberg' equilibrium
The frequency of individuals in the given population with homozygous HbA/hba genotype is equal to number of individuals with homozygous HbA/hba genotype divided by total population.

The frequency of hba allele is equal to

The answer is 9 because to find the amount of neutrons you have to take away the atomic number from the mass
Circadian rhythms ....its just behavior that is repeated over 24 hours