Question: Q: What is the oxygen carrying component of red blood cells called? Choices: - molecule - mitochondria - platlet - hemoglobin A:
Answer: hemoglobin

Question: Q: What is the critical factor for the survival of segmented worms? Choices: - sunlight and water - humidity and sunlight - sunlight and warmth - water and humidity A:
Answer: water and humidity

Question: Q: Heart valves prevent what kind of blood flow from happening in the heart? Choices: - irregular flow - quick flow - slow flow - backflow A:
Answer:
backflow