Tillage can release pollutants in the soil and
increase erosion.
decrease erosion.
promote soil compaction.
promote fertilizer retention

increase erosion   (option a)

Explanation:

Increase erosion.

Explanation:

Tillage is the process of agricultural preparation of soil by digging, stirring and overturning using mechanical methods.

Advantages of Tillage:

Tillage loosens and aerates the top layer of the the soil facilitating the crop planting.

It helps mix the harvest residue, organic matter and the nutrients evenly.

Destroys the weeds mechanically.

Dries the soil before seeding (in wetter climates tillage helps in keeping the soil drier).

When done in autumn, helps exposed soil crumble over winter through frosting and defrosting, which helps prepare a smooth surface for spring planting.

increases it

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y