Final answer:
GM crops cannot be contained due to the spread of GM traits through cross-pollination and hybridization.
Step-by-step explanation:
The reason GM crops cannot be contained is due to the process of genetic modification. When genes are inserted into a plant's DNA to create a genetically modified crop, those genes can spread through cross-pollination and hybridization. This means that GM traits can be transferred to non-GM crops or wild relatives, making containment difficult.
An example of this is the case of organic farmers finding their corn crops contaminated with genetically engineered DNA. Despite efforts to keep GE crops out of organic production, the spread of GM traits can occur through the wind, insects, or other means.
In conclusion, the spread of GM traits makes it challenging to contain genetically modified crops.