In one or two sentences, describe how an invasive species can be introduced into an ecosystem by humans. Name a specific situation and species and how it would affect the ecosystem

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

c is the answer because when something is left after something evaporates that shows the chemical change.

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock