When amino acids are degraded for energy or glucose production, their amine groups are incorporated by the liver into .

The correct answer is - urea.

Explanation:

In our body, to produce energy or produce glucose our body breaks the amino acids, it gets from proteins mainly. These amino acids are mainly breakdown into amine groups.

The human body has a unique ability to pack ammonia(amine group) by converting it to urea and incorporated and produced by the liver using 2 molecules of ammonia (NH3) and 1 molecule of carbon dioxide (CO2).  This incorporated urea is then secreted from the liver and incorporated into the urine in the kidney for further process.

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

answer; both surfaces of the membrane are nonpermeable