Evolution of the male and female reproductive organs is necessary for the advancement of mating strategies that range from simple to complex living beings. This is a kind of adaptation those which have phenotypic characteristics favourable to attract the mates will reproduce the offspring. These traits will be passed on to the progeny and evolution of the species will take place.
The amount of carbon dioxide will be higher on the city road because there are less plants to convert carbon dioxide to oxygen through the process of photosynthesis.