IELTS READING – WHEN EVOLUTION WORKS AGAINST US S52AT3
IELTS READING S52AT3
WHEN EVOLUTION WORKS AGAINST US
Life has changed in just about every way since small tribes of hunter-gatherers roamed the earth armed with nothing but spears and stone tools. We now buy our meat from the supermarket rather than stalking it through the jungle; houses and high-rises shelter us at night instead of caves. But despite these changes, some very basic responses linger on. The short, Q29 sharp feeling of heightened awareness that sweeps through us when a stranger passes in a dark alley is no different, physiologically speaking, from the sensation our ancestors experienced when they were walking through the bushes and heard a dry twig snap nearby. It’s called the ‘fight or flight’ response, and it helps us to identify dangerous situations and act decisively by, as the name suggests, mustering our strength for a confrontation or running away as fast we can.