Scientists have developed a synthetic substance that can

The answer is replace damaged nerve tissue.

Explanation:

In this case, brain nerve tissue refers to the part of human body that receives stimuli in order to send an impulse to the spinal cord and brain, while the nerves are the way the answer travels back. Nowadays, there is a synthetic substance that can replace damaged nerve tissue, making this option the correct one.

salt is a type of solid, which means that it will when placed in water.

  a.  

soluble, float

  b.  

soluble, dissolve

  c.  

insoluble, settle

  d.  

insoluble, dissolve

it provided for selection of government employees through competitive examinations. it also made it unlawful to fire or demote covered employees for political reasons or to require them to give political service or payment, and it set up a civil service commission to enforce the law.

explanation: