Cycads, conifers and flowering plants are all considered to be
a. vascular seed-forming plants.
b. vascular spore-forming plants.
c. non-vascular seed-forming plants.
d. non-vascular spore-forming plants.

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: