The reason why some of us enjoy taking risks might have something to do with early humans.Risk­takers were better at hunting, fighting or exploring.Being better at those things meant a __1__ (great) chance of survival.As the quality of risk­taking __2__ (pass) from one generation to the next, humans ended up with a sense of adventure and a tolerance for risk.

You may wonder __3__ not all people enjoy taking risks.Well, even 200,000 years ago, too much risk­taking could get one __4__ (kill)£®As a result, humans developed a range of character types __5__ still exist today.So maybe you love car racing, __6__ maybe you hate it.It all depends on your character.

No matter where you are on the risk­seeking range, scientists say that your __7__ (willing) to take risks increases during your teenage years.This is when you start to move away from your family and into the bigger world.__8__ (help) you do that, your brain increases your hunger for new experiences.New experiences often mean __9__ (take) some risks, so your brain raises your tolerance for risk as well.

As experts continue studying human brains, we'll know more __10__ the science of risk­seeking.