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 lies between the continental shelf and the abyssal plain? Answer: continental slope
[EX A]: The continental slope lies between the continental shelf and the abyssal plain. It has a steep slope with a sharp drop to the deep ocean floor.

[EX Q]: Question: While most mammals give birth to live young, monotremes can do what? Answer: lay eggs
[EX A]: Monotremes can lay eggs, but most mammals give birth to live young.

[EX Q]: Question: What type of species can alternate between medusa and polyp forms? Answer: cnidarian
[EX A]:
As you can see in Figure below , both body plans have radial symmetry. Some cnidarian species alternate between medusa and polyp forms. Other species exist in just one form or the other.