Step-by-step explanation:
Positives:
1. From the old world to the new world: sugar cane
The Spanish brought sugar to Mexico and Peru in the 16th century.
2. From old World to new world: cows, oxen, horses, donkeys, pigs, sheep
Cattle were brought to Mexico in 1521. they became an important source of food and pulling and lifting heavy loads. the horses allowed hunters to travel great distances and increased the area over which natives searched for food. donkeys were important pack animals. pigs and sheep were used for food and clothing.
3. From the new world to old-world: potatoes
The climate and soil if northern Europe were well suited to grow potatoes.
4. From the old world to the new world: bananas
First grown in southeast Asia and brought to Caribbean islands in 1516.
Negative:
1.From the old world to the new world: rat infestation
Rats hitched rides on ships carrying English settlers.
2. From the new world to old-world: sand fleas
They penetrate human skin. they deposit eggs under the skin and can cause dangerous infections.
3.From the old world to the new world: diseases that devastate animals
European animals brought diseases with them that attacked llamas and alpacas.
4.Old world to new world: exploitation of workers and slavery
loss of life from war and disease created a shortage of labour. Europeans turned to Africa to fill their needs for workers.