Your answer would be Physical weathering because it is being caused by a physical being acting upon something
Crops that humans grow have decended from wild plants and are resistant to diseases and pest.
Explanation:
- The science of growing crops is known as agriculture.
- Humans have been developing agriculture since times immemorial.
- They have selected and cultivated crops that gave a better yield and developed new varieties by cross breeding Superior varieties with the inferior ones.
- Usually the cross bred varieties are cultivated and are resistant to pests and diseases.
This isn't possible except you have a system where there isn't competition and the survival of the fittest in the aspect of the food chain
