The right choice should be A and C. Flat worm and round worm.
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This would be because the grass that they eat are in the area that the zebra population is booming in.
Answer - Well there are many benefits but heres are the mainly benefited engineer crops.
Helps resistant against the bacterial or contagious disease that can kill crops.
Helps create the reproduction/production of bigger (size) crops.
Helps create modified crops for more nutritive values.
These are the few main reasons but theres more.