Given a scientific question, generate a correct answer to it.

[EX Q]: Differences in density between water and air lead to differences in what?
[EX A]: pressure

[EX Q]: What happens when turgid cells in a nonwoody tissue push against each other?
[EX A]: the tissue stiffens

[EX Q]: What structure shows the bonding between atoms, with dots representing available electrons?
[EX A]:
lewis structure