And pulled behind disks [of the tractor], the harrows combing with iron teeth so that little clods broke up and the earth lay smooth.

Iron teeth (Apex)

Explanation:

Which word or words creates a negative tone toward the tractor

we need the image for this one mate

the correct answer is:

this is an example of the writer telling through description rather than showing through dialogue.

sometimes writers like to explain explicitely what's happening instead of adding dialogues of the situations., which is the case in this passage,