How is the air in tube 4 kept out of contact with the nail​

What are the 4 phases of matter in order of increasing engery content?

What are transitions between a liquid and a solid called? identify which way they are transitioning

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.