Answer:
1.5
Explanation:
The greatest probability must not exceed 1

Thymine is a nitrogenous base found in the DNA of all living organisms
Root system represents the underground part of the plant. It includes roots, tubers, and rhizoids.
Explanation:
Shoot system refers to the components of a plant, which grows above the ground. It includes stems, leaves, flowers, seeds, fruit, and buds.