Today in a city it is common to see a raccoon unlatching a Garbage can looking for leftovers or jumping across power lines moving from one rooftop to another. This shows the animal is trying to adapt its behavior to city life. This has been going on since cities started coming up a thousand of years ago. Today biologists are seeing animals and plants adapting in a basic way to survive in cities. And all of this is because of their genes changing.

Genes are DNA segments that impact on how an animal or a plant looks and functions.An organism’s DNA are like an instructional book for it shows how it grows and develops. Some instructions guide its reproductive pattern. Others control the way it moves

Urban traffic, pollution, and lessening of spaces have caused changes in these genetic instructions. Scientists have been trailing signs of these genetic changes. They have seen it in fish in polluted Hudson river in New York. In France on weeds growing on sidewalks. In Nebraska on cliff swallows that live near highways and throughout the New York city parks in scampering mice.

Evolution occurs when genes respond to their environment. Some of these changes may leave plants and animals best suited to their homes. It may provide traits that are new to organisms thus increasing their odds of survival long enough for them to produce. This means a person would pass on his new trait to his children.Eventually, traits that were once rare would now become ordinary throughout the population.

until recently, scientists thought evolution occurred much slowly for people to notice throughout their lifetime.But not anymore, for it can be shown now evolution can happen a lot faster than many people think.This is according to Isaac Wirgin who’s an expert in environmental medicine in a medical university center in New York.He did some studies on how the environment may affect animals health including humans.

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