There are different types of observers. Casual observers differ from scientific observer. Seeing and observing are two different things. Not that everybody seeing is actually observing the thing.
A casual observer just sits back and watch for something to happen while a scientific observer comes up with some hypothesis to work on it.
Ploynucleotide, which would have have similar methods for storing and transmitting genetic information to Earth.
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Explanation:
The exoskeleton of anthropod gets shed, just like a snake, almost..
