The group sped away from the police.He sped up his writing in order to finish the test before the time ran out.
Sped up.
The past participle of "sped" is "sped."
Sped is the preterit,( I sped) past conditional ( I would have sped), and plusperfect (I had sped) of the verb speed.
The answer is DESERTIFICATION
Improved speed?
Sped up dilvery
by the use of catalyst or by heat
Sped up dilvery
The process is called desertification.
yes
enzyme sped up the chemical reaction