I want to know the answer to the following question:
Why are  the fruit fly and the nematode the most intensively studied metazoan model organisms?
All the background I'm provided with is that "Because they are easy to keep and breed, the fruit fly Drosophila melanogaster and the nematode Caenorhabditis elegans have long been the most intensively studied metazoan model organisms, and were among the first life-forms to be genetically sequenced.". Is that enough to answer the question?
Answer: yes