What does a protoplanetary disk most likely have in common with Earth's Solar System? A. They both decrease in gravity as they accumulate more mass. B. They both have well-defined planets that orbit due to gravity. C. They both have planets that have formed without gravity. D. They both are in motion and are held together by gravity.

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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:

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.