Question: Q: What are small organelles and are the site of protein synthesis? Choices: - nucleus - vacuoles - chloroplasts - ribosomes A:
Answer: ribosomes

Question: Q: Why does warm air rise higher in the troposphere? Choices: - it is more dense than cool air - It contains hydrogen - it is less flourishing than cool air - it is less dense than cool air A:
Answer: it is less dense than cool air

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