Question: Q: What is another term for chemical messenger molecules? Choices: - pheromones - enzymes - acids - hormones A:
Answer: hormones

Question: Q: Traditionally, mammals were divided into groups based on what? Choices: - their sizes - their colors - their behaviors - their characteristics A:
Answer: their characteristics

Question: Q: Alveoli can be found in which organ in the human body? Choices: - Stomach - Liver - Heart - lungs A:
Answer:
lungs