Neptune can be divided into a total of different layers.

Four layers

Explanation:

There are total four layers of Neptune. These four layers are - core, mantle, atmosphere, and upper atmosphere

a)Core – It is made up of rock and ice

b)Mantle – It is made up of water, ammonia, and methane ices.  

c)Atmosphere – It is made up of hydrogen, helium, and methane gas

d)Upper Atmosphere – It has trace amount of helium  

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in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: