The nurse is describing some of the developmental milestones the mother of a 3-month-old boy with Down syndrome can expect to see in her child.
Which statement describes the milestones that are expected in a child with Down syndrome?

a) "He will be speaking in sentences at 21 months of age."
b) "Bladder training can be expected by 2.5 to 3 years of age."
c) "You can expect him to eat with his hands by age 12 months."
d) "He'll be crawling all over the house by 9 months of age."

c) "You can expect him to eat with his hands by age 12 months."

Explanation:

Babies born with down syndrome usually have delays in development in some areas, as they tend to achieve milestones at later months, when compared with the normal milestones a healthy baby will attain.

The statement that describes the milestone expected in a child with down syndrome  is "You can expect him to eat with his hands by age 12 months"  

The other statements do not align with the milestone you would expect to see in a child born with down syndrome, as crawling, bladder training, and speaking in sentences should be expected to occur later than the months stated for each milestones in the above statements given in the question above.  

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

because of