A willingness to learn by mistakes made and the mistakes of others will only improve the overall performance of an employee. If an employee is unwilling to learn to improve themselves it will hold an employee back from the possibility of advancement.
Well, I see that in this case you mentioned both, as the prof requested.
Arriving to work on time shows co-workers and management that the position is valued, and desired. An employee that is not dependable can cause overtime issues as well as conflicts with co-workers.
Again, you succeeded in doing both.
Those who are not team oriented cause morale issues and become burdens to their fellow co-workers. Morale issues develop because someone feels they are doing more work then someone else. Burdens happen due to the other employees not putting forth their best effort or by not handling their share of the work or project. An employee who contributes to the team and can lead it toward overall success is a good employee.
In this case, you succeeded again. However, only that brief last sentence shows what happens if the person is a team player (i.e. leads the team to success") but you could write a little more.
Overall, this is very good!!