The following problem deal with words and terms.
Put the following sequences of terms in the order of increasing intension:
a. conifer, Sitka spruce, tree, spruce, plant
b. Italian sports car, car, vehicle, Maserati, sports car
c. doctor of medicine, person, brain surgeon, professional person, surgeon
d. wallaby, marsupial, mammal, animal, kangaroo e. parallelogram, polygon, square, rectangle, quadrilateral