Answer the following question given this paragraph: There are about 50,000 vertebrate species, and they are placed in nine different classes. Five of the classes are fish. The other classes are amphibians, reptiles, birds, and mammals. Table below lists some of the distinguishing traits of each class. Q: There are about 50,000 vertebrate species, and they are placed in how many different classes? A:

OPTIONS:
- four
- ten
- three
- nine

Answer: nine

Answer the following question given this paragraph: Q: What creates charged regions in a water molecule? A:

OPTIONS:
- nonpolar bonds
- ionic bonds
- noncovalent bonds
- polar covalent bonds

Answer: polar covalent bonds

Answer the following question given this paragraph: Vitamins and minerals do not provide energy, but they are still essential for good health. The needed amounts generally can be met with balanced eating. However, people who do not eat enough of the right foods may need vitamin or mineral supplements. Q: Although vitamins and minerals do not provide what, they are still essential for good health? A:

OPTIONS:
- flavor
- antioxidants
- enzymes
- energy

Answer: energy

Answer the following question given this paragraph: Homeostasis, or the maintenance of constant conditions in the body, is a fundamental property of all living things. In the human body, the substances that participate in chemical reactions must remain within narrows ranges of concentration. Too much or too little of a single substance can disrupt your bodily functions. Because metabolism relies on reactions that are all interconnected, any disruption might affect multiple organs or even organ systems. Water is the most ubiquitous substance in the chemical reactions of life. The interactions of various aqueous solutionssolutions in which water is the solventare continuously monitored and adjusted by a large suite of interconnected feedback systems in your body. Understanding the ways in which the body maintains these critical balances is key to understanding good health. Q: The maintenance of constant conditions in the body is also known as what? A:

OPTIONS:
- consciousness
- mononucleosis
- hypothesis
- homeostasis

Answer:
homeostasis