Characteristics of primitive monkey which was in the direction of evolution of man:

1. Thumb parallel to fingers:
- The characteristic of having a thumb parallel to the fingers is not unique to the primitive monkey, but it is a characteristic seen in primates, including humans.
- This opposable thumb allows for precision grip and fine motor skills, enabling the manipulation of objects and tools, which is an important attribute for advanced primates like humans.

2. 32 teeth:
- The primitive monkey had 32 teeth, which is the same number of teeth that humans have.
- This dental formula consists of 8 incisors, 4 canines, 8 premolars, and 12 molars (including 4 wisdom teeth).
- Having a similar dental formula suggests that the primitive monkey and humans share a common ancestor and are part of the same evolutionary lineage.

3. Prehensile tail:
- A prehensile tail refers to a tail that can be used for grasping and holding objects.
- While many monkey species have prehensile tails, humans do not possess a tail at all.
- The absence of a prehensile tail in humans is believed to be a result of natural selection and evolutionary adaptations that favored the development of bipedalism and other characteristics associated with human locomotion.

4. Flat nose:
- The characteristic of a flat nose is not specific to the primitive monkey or humans alone but is a common feature seen in many primate species.
- The flat nose is a result of adaptations for enhanced olfactory abilities and improved respiratory functions.
- The shape of the nose can vary among different primate species, but the overall flatness is a shared characteristic.

In summary, while the thumb parallel to the fingers, 32 teeth, prehensile tail, and flat nose are all characteristics observed in primates, the specific characteristic of having 32 teeth is the most relevant to the evolution of humans. The dental formula of 32 teeth is shared between the primitive monkey and humans, indicating a common ancestry and evolutionary direction.