>>11916235Have you heard of mutations?
Mutations are good and bad. Mutations are the reason why natural selection takes place and also directly correlates with the success of species.
Mutations happens in many ways. Some are UV, toxins, random mutations.
UV is from the sun and is literally unavoidable.
Toxins are mostly from foods and thus can be avoided/
Random mutations are, well random. You occur because cells sometimes incorrectly read and write your DNA. Normally when such inconsistencies occur, apoptosis happens. Sometimes, these rogue cells are able to circumvent this process and grow and multiply, unbounded and unguarded. This is cancer.
Your body is 99% capable of avoiding cancers. 1% slip out and are the reason why cancers are widespread.
Genetics do play a role. To what extent is actually unclear.
The underlying mechanism if cancers is fairly complex.
You might find it interesting that it is generally expected that, the larger the animal, the higher the probability of that species suffer from cancer. In reality, this is untrue and it's actually lower for elephants than humans. This is also called as Peto's paradox.
