Which of the following organ systems perform interrelated functions within the human body?
i. excretory and digestive
ii. circulatory and respiratory
iii. reproductive and endocrine
iv. skeletal and muscular

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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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).

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whats the drop down answers ?

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