During tubular secretion, certain molecules are actively secreted from the into the for excretion.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

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: