Q: The pain of angina means the heart muscle fibers need more what? Choices: - water - carbon - nitrogen - oxygen A:
oxygen

Q: Snow and ice may also undergo which process where there is intense sunlight, very cold temperatures, and dry winds? Choices: - amplification - crystalline - increasefixation - sublimation A:
sublimation

Q: Q: The galapagos islands are a group of 16 volcanic islands 600 miles off the west coast of what continent? Choices: - north america - europe - asia - south america A:
A: south america

Question: Q: Ether molecules have an oxygen atom and can engage in hydrogen bonding with which other molecules? Choices: - carbon dioxides - proteins - lipids - water A:
Answer: water

*Question*
Q: In a model of a hemoglobin molecule, the purple part indicates the presence of what element? Choices: - gold - helium - silver - iron A:
**Answer**
iron

(Q).
Q: What type of charge do electrons have? Choices: - positive - neutral - bipolar - negative A:
(A).
negative