Answer the following question given this paragraph: Only a tiny fraction of the ocean floor has ever been studied. Why? Humans can't travel deep below the water's surface without special vehicles. The pressure of the water is too great. Total darkness and extreme cold make it even more difficult. That's why people have worked for decades to invent technology for studying the ocean floor. Q: What is the name of artificial barriers that people build to protect shorelines? A:

OPTIONS:
- seawalls
- domes
- outcroppings
- breakwaters

Answer: breakwaters

Answer the following question given this paragraph: An example of this process occurs in the kidney. Glucose, water, salts, ions, and amino acids needed by the body are filtered in one part of the kidney. This filtrate, which includes glucose, is then reabsorbed in another part of the kidney. Because there are only a finite number of carrier proteins for glucose, if more glucose is present than the proteins can handle, the excess is not transported and it is excreted from the body in the urine. In a diabetic individual, this is described as "spilling glucose into the urine. " A different group of carrier proteins called glucose transport proteins, or GLUTs, are involved in transporting glucose and other hexose sugars through plasma membranes within the body. Channel and carrier proteins transport material at different rates. Channel proteins transport much more quickly than do carrier proteins. Channel proteins facilitate diffusion at a rate of tens of millions of molecules per second, whereas carrier proteins work at a rate of a thousand to a million molecules per second. Q: What happens when more glucose is present than the proteins can handle, in the body? A:

OPTIONS:
- cultured as urine
- metamorphosed as urine
- forms urine
- excreted as urine

Answer: excreted as urine

Answer the following question given this paragraph: An ionic bond is electrostatic in nature. Q: What is an ionic bond in nature? A:

OPTIONS:
- magnetic
- radioactive
- kinetic
- electrostatic

Answer: electrostatic

Answer the following question given this paragraph: Saturated hydrocarbons contain only single bonds between carbon atoms. They are also called alkanes. They may form straight-chain, branched-chain, or cyclic molecules. Compounds with the same number of atoms but different shapes are called isomers. Q: What is another word for saturated hydrocarbons? A:

OPTIONS:
- catalysts
- enzymes
- aldehydes
- alkanes

Answer:
alkanes