Q: Do tropical regions have very high or very low rates of immigration? Choices: - medium - too high - low - very high A:
very high

Q: What system is involved in diseases that include type 1 diabetes, rheumatoid arthritis and multiple sclerosis? Choices: - circulatory system - nervous system - digestion system - immune system A:
immune system

Q: In the lungs, bicarbonate is transported back into the red blood cells in exchange for what? Choices: - phosphate - glucose - oxygen - chloride A:
chloride

Q: Some compounds containing hydrogen are members of an important class of substances known as what? Choices: - proteins - ions - bases - acids A:
acids