An 18,000-watt radio station transmits at 680 kHz. Calculate the energy of a single photon at the transmitted frequency. 4.5 x 10 -28 J/photon
1.2 x 10 -29 J/photon
4.5 x 10 -31 J/photon

not sure if this is what you'r looking for eubacteria and archaebacteria

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:

69 is the correct math for the amino acids