Answer:
The correct answer will be-short life span and rapid reproductive.
Explanation:
Fruit flies or Drosophila melanogaster is a model organism used to study the principles of genetics as:
1. Short life span- they have a very short life span about 40-50 days in which they complete their life cycle.
2. Reproduction- The reproduction in an organism is very rapid that is they reproduce and produce a large number of offsprings in a short period of time.
Thus, scientist uses them to study genetics and observe traits in a small period of time.