When electromagnetic waves strike an obstacle, what usually happens is that part of the wave is absorbed by the obstacle, part is reflected back and part is transmitted through the material.
However, in case of a dark object; the dark object acts as a perfect absorber and absorbs all the electromagnetic waves.
So, the right answer is the diagram showing only absorption of the wave by the surface.
There is variation within the population, due to a mutation. The selection pressure is the drug. The microbes that have the advantageous gene which makes them resistant to the drug are selected for, and reproduce passing on the gene, increasing its allele frequency within the population over time. However, the microbes that do not have the advantageous gene, cannot survive and their number decreases within the popullation.
Nitrifying<span> bacteria in the soil convert ammonia into </span>nitrite<span> (NO</span>2-) and then into nitrate<span> (NO</span>3-<span>). This process is called nitrification. </span>
Blood vessels expand during hot weather and retract/ tighten in cold weather
