Answer the following question given this paragraph: Some volcanoes form over active hot spots . Scientists count about 50 hot spots on the Earth. Hot spots may be in the middle of a tectonic plate. Hot spots lie directly above a column of hot rock called a mantle plume . Mantle plumes continuously bring magma up from the mantle towards the crust ( Figure below ). Q: What substance comes toward earth's crust through mantle plumes? Choices: - rocks - water - gas - magma A:
magma
(Question)
Answer the following question given this paragraph: Q: Which type of muscle fiber can sustain long contractions? Choices: - fast fibres - intense fibers - direct fibers - slow fibers A:
(Answer)
slow fibers
Ques: Answer the following question given this paragraph: All sound waves begin with vibrating matter. The vibrations generate longitudinal waves that travel through matter in all directions. Q: What do all sound waves begin with? Choices: - oscillating matter - talking matter - enclosing matter - vibrating matter A:
Ans: vibrating matter
(Q).
Answer the following question given this paragraph: 55.3 Energy transfer between trophic levels is typically only 10% efficient. Q: Energy transfer between what kinds of levels is generally rather inefficient? Choices: - producer - secondary - apex - trophic A:
(A).
trophic
Ques:Answer the following question given this paragraph: 18.3 Erythrocytes The most abundant formed elements in blood, erythrocytes are red, biconcave disks packed with an oxygen-carrying compound called hemoglobin. The hemoglobin molecule contains four globin proteins bound to a pigment molecule called heme, which contains an ion of iron. In the bloodstream, iron picks up oxygen in the lungs and drops it off in the tissues; the amino acids in hemoglobin then transport carbon dioxide from the tissues back to the lungs. Erythrocytes live only 120 days on average, and thus must be continually replaced. Worn-out erythrocytes are phagocytized by macrophages and their hemoglobin is broken down. The breakdown products are recycled or removed as wastes: Globin is broken down into amino acids for synthesis of new proteins; iron is stored in the liver or spleen or used by the bone marrow for production of new erythrocytes; and the remnants of heme are converted into bilirubin, or other waste products that are taken up by the liver and excreted in the bile or removed by the kidneys. Anemia is a deficiency of RBCs or hemoglobin, whereas polycythemia is an excess of RBCs. Q: The most abundant formed elements in blood, erythrocytes are red, biconcave disks packed with an oxygen-carrying compound called this? Choices: - plasma - hydrogen - pus - hemoglobin A:

Ans:hemoglobin
Ques: Answer the following question given this paragraph: A: With greater reflection off the ionosphere, AM waves can travel even farther at night than they can during the day. Radio receivers can often pick up radio broadcasts at night from cities that are hundreds of miles away. Q: Greater reflection off what atmospheric layer allows am radio waves to travel even farther at night than they can during the day? Choices: - stratosphere - exosphere - troposphere - ionosphere A:
Ans:
ionosphere