Given a scientific passage and an answer, generate a question for the given answer.

Example Input: Passage: The placenta allows nutrients and wastes to be exchanged between the mother and fetus. The fetus is connected to the placenta through the umbilical cord. Answer: umbilical cord
Example Output: What connects the fetus to the placenta?

Example Input: Passage: Biotechnology has been used to create transgenic crops. Transgenic crops are genetically modified with new genes that code for traits useful to humans. The diagram in Figure below shows how a transgenic crop is created. You can learn more about how scientists create transgenic crops with the interactive animation "Engineer a Crop: Transgenic Manipulation" at this link: http://www. pbs. org/wgbh/harvest/engineer/transgen. html . Answer: transgenic
Example Output: What is the term for crops that are genetically modified with new genes that code for traits useful to humans?

Example Input: Passage: The first plants probably evolved from aquatic green algae. They had male and female reproductive organs. However, they lacked true stems, roots, and leaves. Answer: aquatic green algae
Example Output:
The first plants probably evolved from what?