Ques:Q: What kind of weathering is abrasion? Read this paragraph and choose the correct option from the provided answers: Abrasion is another type of mechanical weathering. With abrasion, one rock bumps against another rock. Gravity causes abrasion as a rock tumbles down a slope. Moving water causes abrasion it moves rocks so that they bump against one another ( Figure below ). Strong winds cause abrasion by blasting sand against rock surfaces. Finally, the ice in glaciers cause abrasion. Pieces of rock embedded in ice at the bottom of a glacier scrape against the rock below. If you have ever collected beach glass or pebbles from a stream, you have witnessed the work of abrasion. Choices: - molecular - electromagnetic - natural - mechanical A:

Ans:mechanical
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Ques:Q: When do cells acquire different identities in an ordered spatial arrangement? Read this paragraph and choose the correct option from the provided answers: Choices: - during mitosis - larval stage - before morphogenesis - during morphogenesis A:

Ans:during morphogenesis
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Ques:Q: Where is most digestion completed? Read this paragraph and choose the correct option from the provided answers: Choices: - the cavity - the stomach - the esophagus - the duodenum A:

Ans:the duodenum
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Ques:Q: As a diver descends, the increase in pressure causes the body's air pockets in the ears and lungs to do what? Read this paragraph and choose the correct option from the provided answers: from the atmosphere at sea level. As a diver descends, the increase in pressure causes the body's air pockets in the ears and lungs to compress; on the ascent, the decrease in pressure causes these air pockets to expand, potentially rupturing eardrums or bursting the lungs. Divers must therefore undergo equalization by adding air to body airspaces on the descent by breathing normally and adding air to the mask by breathing out of the nose or adding air to the ears and sinuses by equalization techniques; the corollary is also true on ascent, divers must release air from the body to maintain equalization. Buoyancy, or the ability to control whether a diver sinks or floats, is controlled by the buoyancy compensator (BCD). If a diver is ascending, the air in his BCD expands because of lower pressure according to Boyle's law (decreasing the pressure of gases increases the volume). The expanding air increases the buoyancy of the diver, and she or he begins to ascend. The diver must vent air from the BCD or risk an uncontrolled ascent that could rupture the lungs. In descending, the increased pressure causes the air in the BCD to compress and the diver sinks much more quickly; the diver must add air to the BCD or risk an uncontrolled descent, facing much higher pressures near the ocean floor. The pressure also impacts how long a diver can stay underwater before ascending. The deeper a diver dives, the more compressed the air that is breathed because of increased pressure: If a diver dives 33 feet, the pressure is 2 ATA and the air would be compressed to one-half of its original volume. The diver uses up available air twice as fast as at the surface. Choices: - heat up - expand - blow up - compress A:

Ans:
compress
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