20. most of today’s organisms could not have lived on earth 3.6 billion years ago because there was no in the air then.

If water is at -10 ° c and energy is added to the water until it is 50 ° c while maintaining a constant pressure of 760 mmhg, describe the phase change of the water?

9. wind power creates pollution. water air soil noise

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?