instruction:
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.
question:
Question: Saturn is made mostly of helium and what else? Answer: hydrogen
answer:
Saturn is made mostly of helium and hydrogen.


question:
Question: What begins approximately six weeks after fertilization in an embryo? Answer: ossification
answer:
Ossification begins approximately six weeks after fertilization in an embryo.


question:
Question: The main function of this organ is to filter the blood and remove unwanted red blood cells? Answer: spleen
answer:

The main function of the spleen is to filter the blood and remove unwanted red blood cells.