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.
A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved.However, by itself a fossil has little meaning unless it is placed within some context.rates of alien activity and sock loss) are not related and your results are the product of random chance events. In statistics, the only way of supporting your hypothesis is to refute the null hypothesis.The next step is to compare these two alternatives using the magic of… Rather than trying to prove your idea (the alternate hypothesis) right you must show that the null hypothesis is likely to be wrong – you have to ‘refute’ or ‘nullify’ the null hypothesis.Now a new study from a team of our scientists at UCL helps put to rest these fears.
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.