What is the species introduced into ecosystems, intentionally or unintentionally, and usually by humans? some can take over - perhaps destroying - entire ecosystems. the lionfish is one example?

These are called invasive species (like the Giant African Snails in Galapagos for example.)

i believe you meant to say air rather than hair so the answer is below ")

the dead sea, the lowest place on earth at 430 metres (1,410 ft) below sea level, has a correspondingly high typical atmospheric pressure of 1065 hpa.

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