Which term below represents a pure substance that can be separated chemically but cannot be separated physically that is made up of two or more atoms

Which traits do human embryos have that link them to a common ancestor with fish and reptiles? a. scales and tail b. gill slits and scales c. tail and gill slits d. hair and tail

How much heat is released upon converting one mole of steam (18.0 g) from 100.0 ∘c to water at 25.0 ∘c? show work and constants, trying to figure out how it works. only given the heat capacity for steam and water so try to only use that

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?