Question: Q: At what time of the year can tornadoes occur? Choices: - winter - spring - summer - any A:
Answer: any

Question: Q: What does the base of a nucleotide within dna consist of? Choices: - ribosomes - protein - hydrogen - nitrogen A:
Answer: nitrogen

Question: Q: The earliest types of what lacked flowers, leaves, roots and stems? Choices: - animals - clouds - houses - plants A:
Answer:
plants