Answer the following question given this paragraph: Coronary heart disease often does not have any symptoms. A symptom of coronary heart disease is chest pain. Occasional chest pain can happen during times of stress or physical activity. The pain of angina means the heart muscle fibers need more oxygen than they are getting. Most people with coronary heart disease often have no symptoms for many years until they have a heart attack. Q: The pain of angina means the heart muscle fibers need more what? Choices: - water - carbon - nitrogen - oxygen A:
oxygen
Answer the following question given this paragraph: Snow and ice may also undergo sublimation under certain conditions. This is most likely to happen where there is intense sunlight, very cold temperatures, and dry winds. These conditions are often found on mountain peaks. As snow sublimates, it gradually shrinks without any runoff of liquid water. At the URL below, you can watch a time-lapse video showing sublimation of snow on the highest mountain in the Andes. 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: Answer the following question given this paragraph: The Galapagos Islands are a group of 16 volcanic islands 600 miles off the west coast of South America. The islands are famous for their many species found nowhere else. It was on these islands where Darwin began to develop his theory of evolution. 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: Answer the following question given this paragraph: Ether molecules have an oxygen atom and can engage in hydrogen bonding with water molecules. An ether molecule has about the same solubility in water as the alcohol that is isomeric with it. 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*
Answer the following question given this paragraph: Hemoglobin Molecule. This model represents the protein hemoglobin. The purple part of the molecule contains iron. The iron binds with oxygen molecules. 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).
Answer the following question given this paragraph: Electrons have negative charge and protons have positive charge. The magnitude of the charge is the same for both, . Q: What type of charge do electrons have? Choices: - positive - neutral - bipolar - negative A:
(A).
negative