Dry
California is so arid because most of southern California is deserts.
The prefix of the word "arid" is "a-".
Arid
Ecosystem
Dry is a synonym for the word arid.
Believer
What word has a meaning that's most closely related to the word expeditious?Expedite
A synonym
beauty
observation :)
...
Experiment is the word that defines an investigation in science that is controlled.