If a piece of metal at 70 degrees touches a piece of metal at 40 degrees, . A. Energy will flow from the hotter metal to the cooler metal
B. It’s impossible to tell
C. Nothing will happen
D. Cold will flow from the cooler metal to the hotter metal

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: