1: The brassica plants have the most variation in the leaves. The leaves of brassica plants can change color, texture, and they can be straight or curly. The plants developed these variations through evolution to suite their environment.
2: The brassica plants have those different variations to resist different environments. The different variations also help protect the spies of plants from disease or predators. The brassica plants also differentiate to avoid predators.
3: All of the brassica plants have the same consistent stalk. The stalk is generally green or purple going straight up connecting to the leaves.
4: The different plant breeders would need to take the variation of the brassica seed that they wanted and plant it then after it grows he would need to pick the plant that shows the variation best and repeat the process.
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