In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

[Q]: Question: What kind of system do echinoderms possess? Answer: water-based circulatory
[A]: Echinoderms possess a water-based circulatory system.


[Q]: Question: Fruit fly and brine shrimp hox genes have evolved independently for how long? Answer: 400 million years
[A]: Fruit fly and brine shrimp hox genes have evolved independently for 400 million years long.


[Q]: Question: What aspect of beryllium allows it to absorb x-rays? Answer: low atomic number
[A]:
The low atomic number of beryllium allows it to absorb x-rays.


