Worst that there are also unknown Virus and Bacteria found in the Permafrost, which are also defrosted with the Climate change. A lot are also still life..
Not less evolved. Just evolved differently for alternative environmental circumstances.
There is no hierarchy of evolutionary traits. Just an amalgamation of traits that are or are not useful in the current environment. What genetic makeup is effective in one place and time is useless in another, and what was once useless may now be beneficial.
We have no clue how threatening they could potentially be.
Ok my last input was a bit lazy hence all the armchair biologists tuning in.
Less and more evolved is definitely a thing when alluding to the complexity of the system and since evolution is incremental time helps.
However you are right that adaptability to the environment is the most important thing when defining the success of your "genetic constitution".
I guess my point is that we are more likely to have, in our DNA, evolved adaptation to them than they are to have adaptation to circumvent our immunity.
That being said, yes there are inherent risks to getting those out there, I'm just saying our propensity for enjoying fictional doom scenarios might make us overstate the probability of those occurences.
They are investigating it, some million years in the oldest beeings in Earth don't make evolutive difference to the current ones. The only question is, if they can infect humans or animals or not.
The climate change make that all tipe of indesirable things are defrosted, adding more dangerous diseases to the existing ones.
Viruses and bacteria don't evolve to kill you. They propogate in your system to spread themselves. It's actually in their best interest to keep you alive, so the more evolved ones would be less deadly because they've had more time to dial it in. Not that evolution is something they choose, it's from mutations that work more or less better.