This is play that happens at the spur of the moment.
Spontaneous dancing in the street.
pacemaker cells
improvisations
fibrillation
[A spontaneous demonstration] rumbled from somewhere in the middle of the crowd.Note: In this sentence the noun "demonstration" is the simple subject. This is arrived at by asking the verb rumbled a "what" question. Here though the words "a" and "spontaneous" do modify the simple subject and are properly treated as a part of the full subject in general.
spontaneous
Spontaneous
spontaneous ACCOUNT
'Spontaneous' means "arising from a momentary impulse". There is no animal which represents 'spontaneous'.
spontaneous
A tween can be spontaneous by being themselves.
Spontneous
Spontaneous Inventions was created in 1986.
We're part of such a spontaneous generation!
Spontaneous is an adjective--a spontaneousperson.
Spontaneous, hasty, rash.
It was to answer whether or not Spontaneous generation is possible or not.