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| Extraterrestrials. |
You always hear scientists saying that life on other planets, if it exists, would be fairly similar to life on Earth. But to me, that doesn't really make much sense, and here's why.
First, ALL life on Earth is carbon based. This means that every living thing contains carbon. No matter what it is, bacteria, butterflies, giraffes, or human being, they all contain carbon. A lot of carbon. Because we're carbon based, cells of all living things are designed perfectly for this. Plants use CO2 in the air and convert it into oxygen, while animals use oxygen and convert it into CO2. The reason we need oxygen is because of a process called cellular respiration. If you don't know what this is, I'm not about to explain it, so look it up on wikipedia or something. But anyways, all life on our planet has evolved the way it has because we are carbon based. So what makes us think that life on other planets where life might be based on completely different elements and chemicals, would look anything like what we see?
Next, each living thing on Earth is so perfectly adapted to its own habitat, that if you change something, even something minute and seemingly unimportant, like a few degrees temperature change, or a change in the humidity, it can have devastating effects on the ecosystem. So how could one possibly think that on a different planet, where the ecosystems would be so utterly different from our own, that evolution would run the same course twice? Even if gravity on Earth were a tiny bit stronger or weaker, animal and plant life would be changed drastically.
People underestimate the power of nature and natural selection. And for everyone who tries to deny that life on other planets exists, whether you believe in a higher power, or just that it seems impossible, think about this. Why would a higher power create an incomprehensibly massive universe, and only put life on one of them? That just doesn't seem to make sense to me. And how could one be so egotistical to think that out of the hundreds of billions of planets, life has only managed to sprout on our one lonely planet?
Humans need to realize that nature and the world around us is far bigger than the human race. We're just a small speck that evolution got a little carried away with, and I can't say its better off with us.
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