5 Which three organ systems are directly interacting when a person's brain sends a signal to the person's arm, causing the arm to
move up and down?
OA. muscular system, nervous system, skeletal system
ОВ.
nervous system, urinary system, skeletal system
OC. circulatory system, muscular system, respiratory system
OD. circulatory system, muscular system, skeletal system
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A bc it moves the bones in the arm and the muscles and the nerves are what send the signals to the muscles to move

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:

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.