instruction:
Given a scientific passage and an answer, generate a question for the given answer.
question:
Passage: The Sun gives off energy in tiny packets called photons . Photons travel in waves. Figure below models a wave of light. Notice the wavelength in the figure. Waves with shorter wavelengths have more energy. Answer: photons
answer:
What are the tiny packets of energy the sun gives off called?

question:
Passage: outermost layer of the sun, made up of a plasma that extends millions of kilometers into space. Answer: plasma
answer:
What is the outer layer of the sun made up of?

question:
Passage: The majority of arthropods are insects (Class Insecta). In fact, more than half of all known organisms are insects. There may be more than 10 million insect species in the world, although most of them have not yet been identified. In terms of their numbers and diversity, insects clearly are the dominant animals in the world. Answer: insects
answer:
More than half of all known organisms are what?