Q: Answer the following question given this paragraph: Q: Each enzyme has an optimal what at which its reaction rate is greatest? A:

OPTIONS:
- weight
- size
- precipitation
- temperature

A: temperature

Q: Answer the following question given this paragraph: Most chordates are animals with backbones. These range from small fish to giant whales, from playful dogs to ferocious cats. Not nearly as diverse as the invertebrates. But chordates do have many amazing species. The white tiger ( Panthera tigris ) is a chordate. The tiger is also from the class Mammalia, order Carnivora, and family Felidae, meaning it is a meat-eating cat. Q: What is the order and family of a meat-eating cat like a tiger? A:

OPTIONS:
- Synapsida felidae
- Mammalia felidae
- hierarchies felidae
- carnivora felidae

A: carnivora felidae

Q: Answer the following question given this paragraph: The speed of most waves depends on the medium through which they are traveling. Generally, waves travel fastest through solids and slowest through gases. That's because particles are closest together in solids and farthest apart in gases. When particles are farther apart, it takes longer for the energy of the disturbance to pass from particle to particle. Q: Do waves move faster when particles are close to each other or far away? A:

OPTIONS:
- unaffected
- far away
- open
- close

A: close

Q: Answer the following question given this paragraph: Water pollution happens when contaminants enter water bodies. Contaminants are any substances that harm the health of the environment or humans. Most contaminants enter the water because of humans. Surface water (river or lake) can be exposed to and contaminated by acid rain, storm water runoff, pesticide runoff, and industrial waste. This water is cleaned somewhat by exposure to sunlight, aeration, and microorganisms in the water. Groundwater (private wells and some public water supplies) generally takes longer to become contaminated, but the natural cleaning process also may take much longer. Groundwater can be contaminated by disease-producing pathogens, careless disposal of hazardous household chemical-containing products, agricultural chemicals, and leaking underground storage tanks. Q: What "kind" of water may take longer to become contaminated than surface water, while the natural cleaning process may take longer? A:

OPTIONS:
- lake water
- spring water
- dam water
- groundwater

A:
groundwater