Which of the following is the best definition of the greenhouse effect? A. Warming of the Earth due to the absorption and recycling of heat by the atmosphere
B. Planting of trees in warmer areas to make them grow faster
C. Convection in the atmosphere to bring heated air to the surface
D. Heating of the ocean and land by radiation

I think it's either A or C, but I'm not sure which one.

pretty sure it's c if not then look it up

a and b

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: