Why is the rib at b considered a true rib? t encloses the thoracic cavity and protects the vital organs within?

carbon atoms, hydrogen, oxygen, and nitrogen.

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: