The primary diffrence in the sturcture of ATP and ADP is that the ATP has phosphate groups and ADP has phosphate groups.

d. the weight of the book

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: