Two nitrogen-containing groups are used to make urea in liver cells. What two molecules of the urea cycle contribute these two nitrogen

Ammonia and aspartate are the two molecules of the urea cycle contribute

these two nitrogen used in the formation of urea.

These compounds are produced in the liver through the breakdown of

amino acids in the liver. The amino acids undergo transamination and

deamination reactions which results in the formation of these compounds.

The ammonia which is highly toxic is converted into urea which is then

excreted from the body.

Read more on link

NH4+ and aspartate are the two molecules of the urea cycle contribute these two nitrogen.

Explanation:

Two nitrogen-containing groups are used to make urea in liver cells. The nitrogen atoms enter the urea cycle as NH4+ and aspartate. The first step of the urea cycle take place in liver mitochondria. In liver mitochondria, NH4+ combines with HCO3- to form carbamoyl phosphate.

So,

NH4+ and aspartate are the two molecules of the urea cycle contribute these two nitrogen.

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.

answer;

c. a tree whose roots are surrounded by wet sand.

explanation;

water stress is an important factor limiting the growth and productivity of forests.water stress is the most often cited cause of poor survival and growth of woody landscape plants.

-insufficient soil moisture is the most common form of water stress, but excess moisture that leads to poor soil aeration (hypoxia) can also result in reduced plant vitality. a tree whose roots are surrounded by wet sand would be least likely to experience water stress.