Name the base.
action, active, actor
act
tract + or
photo frame physics
frame
constructed, instructor, structure
struct
attractive
at + tract + ive
dogs cats swims
swims as it is a verb
reinvented, adventure, invent
vent
contracted
con + tract + ed
fish nation invention
fish
conscious, science, scientific
<sc>
unattractive
un + at + tract + ive
zip zit dogs