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 is the smallest unit of time commonly based on? Answer: second

A: Second is the smallest unit of time commonly based on.
****
Q: Question: Unlike wild animals, what type of species are genetically uniform, making them more vulnerable to die-out from disease? Answer: domestic species

A: Unlike wild animals, domestic species type of species are genetically uniform, making them more vulnerable to die-out from disease.
****
Q: Question: When zinc metal is mixed with sulfur and heated, what is produced? Answer: zinc sulfide

A:
Zinc sulfide zinc metal is mixed with sulfur and heated, what is produced.
****