Answer: The "Eustachian tube" helps equalize the pressure within the ear.
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Answer:
In humans, blood group is determined by three alleles 
, 
, and 
.
and are co-dominant whereas is recessive to other two.
Thus, if a person with blood group O produces offspring with blood group B then the other parent must contain allele.
The genotype of other person can be 
, 
, or 
.
There is only one condition in which the person can have offspring with blood group O that is, when the other parent is .
In this condition, the probability of an offspring to have blood group O is 50%.
In other conditions, the probability of an offspring to have blood O is 0%.
<span>the thylakoid space is where the H+ gradient is created by the electron transport chain. if the thylakoid is punctured, the H+ will just leak out into the stroma and NOT diffuse into ATP synthase, thus the synthesis of ATP would be the most directly affected. </span>
The answer is A and D. At first, they are confused with the structure. All they know is the DNA is consists of A, T, C and G. After they know the number relationship, they figure out that base may be pairs(A&T, G&C). Then the X-ray helps them to get the coiled helix structure.
