Answer the following question given this paragraph: These brilliant red "feathers" are actually animals called tube worms. They live in an extreme environment on the deep ocean floor, thousands of meters below the water's surface. Their world is always very cold and completely dark. Without sunlight, photosynthesis is not possible. So what do organisms eat at these depths? Tube worms depend on chemosynthetic microorganisms that live inside them for food. In this and other ways, tube worms have adapted to the extreme conditions of their environment. Q: What do tube worms rely on for food? Choices: - fatty microorganisms - lentiviruses microorganisms - sponges microorganisms - chemosynthetic microorganisms A:
chemosynthetic microorganisms
Answer the following question given this paragraph: The average annual temperature on Earth has been rising for the past 100 years. Q: Has the average annual temperature on earth been rising or falling for the past 100 years? Choices: - unchanged - fluctuating - falling - rising A:
rising
Q: Answer the following question given this paragraph: Q: Each line in a structural formula represents a pair of shared what? Choices: - waves - ions - atoms - electrons A:
A: electrons
Question: Answer the following question given this paragraph: Dogs pant to lose excess body heat. Q: Panting allows dogs to get rid of what? Choices: - fur balls - accumulated toxins - calories - excess body heat A:
Answer: excess body heat
*Question*
Answer the following question given this paragraph: Magnetic resonance imaging (NMR) devices use liquid nitrogen to cool the superconducting magnets. Nitrogen is a gas at room temperature and liquefies at -195.8C. Its neighbor on the periodic table (oxygen) boils at -182.95C. The interactions between nitrogen molecules (N 2 ) are weaker, so the boiling point is lower. Interactions between non-polar molecules depend on the degree of electron fluctuation within the molecule. Q: Magnetic resonance imaging devices use what to cool the superconducting magnets? Choices: - antifreeze - dry ice - fluorocarbons - liquid nitrogen A:
**Answer**
liquid nitrogen
Q: Answer the following question given this paragraph: CHAPTER REVIEW 3.1 The Cell Membrane The cell membrane provides a barrier around the cell, separating its internal components from the extracellular environment. It is composed of a phospholipid bilayer, with hydrophobic internal lipid "tails" and hydrophilic external phosphate "heads. " Various membrane proteins are scattered throughout the bilayer, both inserted within it and attached to it peripherally. The cell membrane is selectively permeable, allowing only a limited number of materials to diffuse through its lipid bilayer. All materials that cross the membrane do so using passive (non energy-requiring) or active (energy-requiring) transport processes. During passive transport, materials move by simple diffusion or by facilitated diffusion through the membrane, down their concentration gradient. Water passes through the membrane in a diffusion process called osmosis. During active transport, energy is expended to assist material movement across the membrane in a direction against their concentration gradient. Active transport may take place with the help of protein pumps or through the use of vesicles. Q: How does a cell's membrane keep extracellular materials from mixing with it's internal components? Choices: - absorbs extracellular materials - repels extracellular materials - destroys extracellular materials - provides a barrier A:
A: provides a barrier