Q: What were the first animals to have true lungs and limbs for life on land? Choices: - birds - mammals - reptiles - amphibians A:
amphibians

Q: What common code do all known living organisms use? Choices: - biochemical - Morse code - code of ethics - genetic A:
genetic

Q: Q: What serves to replace nonreproducing specialized cells as needed in the adult body? Choices: - osteoclast cells - monocyte cells - dendritic cells - stem cells A:
A: stem cells

Question: Q: Helicopters store large amounts of rotational energy of what type in their blades? Choices: - magnetic - seismic - thermal - kinetic A:
Answer: kinetic

*Question*
Q: What is used by sensitive systems to detect even low levels of radiation? Choices: - electrons - radars - ions - crystals A:
**Answer**
crystals

*Question*
Q: What kind of rays can travel thousands of meters through air and can penetrate and damage cells deep inside the body? Choices: - x-rays - cosmic rays - plasma rays - gamma rays A:
**Answer**
gamma rays