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These changes typically occur so slowly that they are barely detectable over the span of a human life, yet even at this instant, the Earth's surface is moving and changing.

As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils.

Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years.

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And depending on how you define ‘long-term’, the findings are the most convincing evidence to date that e-cigarettes are far safer than smoking.The age of the fossil must be determined so it can be compared to other fossil species from the same time period.Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms.Maybe, you hypothesise, aliens are beaming down to steal one sock out of every pair you own.In order to test whether your hypothesis is true or not, you have to carry out some research to see if you can back it up.Tobacco is the world’s leading cause of preventable death, accounting for around 6 million deaths each year.