People tend not to believe/accept things they can't see proof of with their own eyes or things that lack scientific evidence.
Continental drift is something that spans hundreds of thousands of years. People don't live that long to be able to see the position of the continents and land changing over time. Also when Wegener proposed this theory, he couldn't explain how continental drift occurred, so lacking scientific evidence, many people did not believe him.<span />
This was Lamarck's idea. Here's an example: Suppose giraffes originally had short necks that they stretched to reach high-up leaves in the trees. This continuous stretching of the neck was passed onto offspring, who as a result had slightly longer necks. This continued for multiple generations until we get today's long-necked giraffe. Lamarck was on to something (that something being evolution by natural selection, which Darwin discovered), but his theory wasn't completely correct since organisms can only pass on genes (segments of DNA that code for a characteristic or function) to their offspring. Since "stretching" would not code into DNA, it wouldn't be passed onto offspring, proving Lamarck's theory incorrect.
Introduced to a habitat similar to their own introduced to a habitat different than their own outcompete native species generally have no native predators generally have native predators often have high reproductive rates often have low reproductive rates can tolerate a range of conditions
