Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

[EX Q]: Question: What is the charge on a single electron known as? Answer: elementary charge
[EX A]: The charge on a single electron is and is known as the elementary charge.

[EX Q]: Question: Like mammals and birds, and unlike other reptiles, crocodiles have how many chambers in their heart? Answer: four
[EX A]: Like mammals and birds, and unlike other reptiles, crocodiles have a four-chambered heart. But, unlike mammals, blood with and without oxygen can be mixed.

[EX Q]: Question: What type of reproduction results in genetically unique offspring? Answer: sexual reproduction
[EX A]:
Sexual reproduction results in offspring that are genetically unique. They differ from both parents and also from each other. This occurs for a number of reasons.