Salt acid base or just an acid
An arrangement of genes consisting of an operator, a promoter, and a repressor is an OPERON.
Infectious agents are those that corrupt and prey on an organism or a host. This is sometimes called parasitism when a foreign organism consumes a host by preying on its nutrients and food. Hence, we are uncertain in Anna's case because there is no clear description of her symptoms.
The correct answer is low precipitation.
The cause of limited water supplies is reduced precipitation or low precipitation.
Precipitation is termed as any product of condensation which is of atmospheric water vapour which falls under gravity.
Forms of precipitation can be sleet, snow, graupel, hail, drizzle, and rain.
Precipitation occurs when portion of atmosphere comes to being saturated with water vapor such that water condenses and then it precipitates.
It is the major component of water cycle and deposits fresh water to planet.