Q: Humans have about 20,000 to 22,000 genes scattered among 23 of these? Choices: - neutrons - ribosomes - atoms - chromosomes A:
chromosomes

Q: What natural process allows water to return again to the earth's surface? Choices: - erosion - currents - wind - precipitation A:
precipitation

Q: Bioluminescence is an example of what type of activity that is carried out by a cell and is precisely coordinated and controlled? Choices: - growth - respiration - reproduction - metabolic A:
metabolic

Q: What are the smallest particles of water called? Choices: - hydrogen - atoms - ions - molecules A:
molecules