A leavening agent is an organism or substance that when added to a dough[?] of flour and water causes it to "rise" by evolving carbon dioxide or other gasses that become trapped as bubbles[?] within the dough.
... pending.
In British service, the aircraft is supposed to replace the Tornado F3 and the Jaguar GR3A[?].
The Tornados will be replaced from 2006-2010, and the Jaguars ...