instruction:
Given a scientific passage and an answer, generate a question for the given answer.
question:
Passage: Large viruses were once parasitic cells inside bigger host cells. Over time, genes needed to survive and reproduce outside host cells were lost. Answer: parasitic
answer:
Large viruses began as what type of cells inside bigger host cells?

question:
Passage: gametes swim with the aid of their flagella to the female gametangium (the archegonium), and fertilization ensues. The zygote grows into a small sporophyte still attached to the parent gametophyte. It will give rise, by meiosis, to the next generation of spores. Liverwort plants can also reproduce asexually, by the breaking of branches or the spreading of leaf fragments called gemmae. In this latter type of reproduction, the gemmaesmall, intact, complete pieces of plant that are produced in a cup on the surface of the thallus (shown in Figure 25.11)are splashed out of the cup by raindrops. The gemmae then land nearby and develop into gametophytes. Answer: flagella
answer:
Gametes swim with the aid of what structure to the female gametangium, and fertilization ensues?

question:
Passage: The small surface zone that has light is the photic zone. The entire rest of the ocean does not have light and is the aphotic zone. Answer: aphotic zone
answer:
What do you call the lightless part of the ocean?