1.Cultivator is a tractor driven implement used for 2.The are nutrition-specific 3.The improves the soil texture 4.Seed drills help in sowing of seeds

1) Stirring and pulverizing the soil before seeds are planted or removed as well as to loosen the soil in order to allow enough air into the soil.

2) Vitamin A, zinc supplementation and exclusive breastfeeding

3)Manure from horses, cows or cattle

4) Mechanical

Explanation:

A cultivator is a farm implement used for stirring and pulverizing the soil before seeds are planted or removed as well as to loosen the soil in order to allow enough air into the soil. This enables the crop to grow quicker. It is driven by a tractor and does more work than the harrow which is not tractor driven.

Nutrition-specific intervention is a programme by UNICEF to talk undernutrition in foetus as well as growing children. The nutrients specified are exclusive breastfeeding, vitamin A and zinc supplementation.

Manure is referred to as major component used to aid crop growth. It contains essential nutrients which are required by crops for growth and  good health. Manure is natural and can be gotten from animal dung.

Seed drills are sowing machines used to sow seeds accurately at the precise depth and distance measured. It does an extra work of covering the soil as well as protecting the seeds from birds. Due to the fact that it is a machine, it saves time and labour as well as money.

b brown mice / white sand dunes

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.