@schlampe: LOL..
@pyrogram: Oh no, when I say planetary ecosystem, I mean the array of living organisms interacting with the nonliving bio-components of the entire planetary system. Which is why a different planet would have a radically different ecosystem. While marine life is very very very different from terrestrial organisms, they are still part of the same planet that has the same gravity, same mass, same orbit etc. and they still use water as a solvent. I'd like a link to where you read that because it's interesting LOL. Biology and chemistry 'biochemistry' is the foundation for understanding everything that an alien could be like. For example, everything on Earth is carbon-based but elsewhere an extraterrestrial could be silicon-based but that's unlikely for a number of reasons. For one, unlike carbon, silicon doesn't have the ability to form chemical bonds with diverse types of atoms which would be necessary for the chemical versatility required for things like metabolism.
Elements creating organic functional groups with carbon include hydrogen, sulfur, nitrogen, phosphorus, oxygen, iron, magnesium etc. while silicon interacts with very few other types of atoms. And with the atoms that it does interact with, silicon creates molecules that are monotonous compared with organic macromolecules because silicon atoms are really big and have a large mass and atomic radius so its difficult for silicon to form double bonds which is fundamental for bio-organic chemistry. There's also the issue that the atmospheric composition of most planets may not be conductive to the development of silicon-based lifeforms because there wouldn't be much silicon in its atmosphere. This is because when you look at the interstellar medium, which are the clouds of gas or the spaced out molecules that are in the space between stars, you find that there are over a hundred different carbon-based molecules out there and there aren't even ten silicon-based molecules molecules out there. And out of that small number, a few of those silicon-based molecules actually include carbon so the cosmic abundance of silicon does not seem very promising. This suggests that there's a greater variety of complex carbon compounds throughout the cosmos, providing less of a foundation for silicon-based biologies to develop.
Oh I'm not disputing that intelligence doesn't have a minimum requirement, I'm saying that the difference between our biology and an alien one would be too radical. For example, the alien and the human can achieve interstellar travel using mathematics and engineering. But our concept of numeracy could be very different. So while our mathematics may be just as advanced as theirs, we wouldn't share the organs responsible for the cognitive processes required to understand the other's mathematical concepts. Which is why even if a jellyfish or a worm were as intelligent as a human, you wouldn't be able to explain the concept of metaphysics to them because while of the same intelligence, they wouldn't have a neocortex which is what allows us to develop and understand these concepts which is why a human without a neocortex wouldn't be able to understand a normal human's concept of metaphysics. And the only reason dogs can understand the concept of a 'loved one' is because all mammals have a neocortex, that's why you can't condition a reptile to 'love' you. You can condition it to tolerate your presence and respond to it, but it won't 'love' you because it doesn't have a neocortex with which to understand the concept, and we all evolved in the same planetary ecosystem, an alien and a human wouldn't share that luxury. So it isn't a matter of intelligence, its a matter of whether or not we have the necessary organs that'll provide the cognitive processes we would need to understand an alien concept.
As for the topic of language, you can actually communicate with pulses of lights. The military for example use flares to communicate with one another. Several species of insects and bacteria use bio-luminescence as a means of communication, and bio-luminescence is the emission of light by living organisms LOL. You should study up on biology because animals communicate through a wide variety of manners, through olfaction and the emission of different scents for example.
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