Q: Answer the following question given this paragraph: Echinoderms have a unique water vascular system with tube feet. This allows slow but powerful movement. Q: What types of living beings have water vascular systems and unique tube feet? A:

OPTIONS:
- diatoms
- mollusks
- Ducks
- echinoderms

A: echinoderms

input: OPTIONS:
- the cervix
- the uterus
- the Fallopian tube
- the vulva Now, answer this question: Answer the following question given this paragraph: The external female reproductive structures are referred to collectively as the vulva. They include the labia (singular, labium), which are the "lips" of the vulva. The labia protect the vagina and urethra, both of which have openings in the vulva. Q: The external female reproductive structures are referred to collectively as what? A:
A:
output: the vulva

Answer the following question given this paragraph: Q: Because action potentials are so brief, a neuron can produce hundreds per what? A:

OPTIONS:
- day
- minute
- lifetime
- second

Answer: second

Problem: OPTIONS:
- spontaneous mutation
- mass extinction
- natural selection
- secondary succession
Q: Answer the following question given this paragraph: Secondary succession occurs in a formerly inhabited area that was disturbed. Soil is already in place, so pioneer species include small plants such as grasses. Q: What occurs in a formerly inhabited area that was disturbed? A:
Answer: secondary succession

Problem:OPTIONS:
- intestines
- brain
- stomach
- mouth

Answer the following question given this paragraph: The mouth also begins the process of mechanical digestion . Sharp teeth in the front of the mouth cut or tear food when you bite into it (see Figure below ). Broad teeth in the back of the mouth grind food when you chew. Food is easier to chew because it is moistened by saliva from the salivary glands. The tongue helps mix the food with saliva and also helps you swallow. After you swallow, the chewed food passes into the pharynx. Q: Where does mechanical digestion begin? A:
****
A: mouth

Problem:OPTIONS:
- it increases
- it stays the same
- it doubles
- it decreases

Answer the following question given this paragraph: The nonmetals are elements located in the upper right portion of the periodic table. Their properties and behavior are quite different from those of metals on the left side. Under normal conditions, more than half of the nonmetals are gases, one is a liquid, and the rest include some of the softest and hardest of solids. The nonmetals exhibit a rich variety of chemical behaviors. They include the most reactive and least reactive of elements, and they form many different ionic and covalent compounds. This section presents an overview of the properties and chemical behaviors of the nonmetals, as well as the chemistry of specific elements. Many of these nonmetals are important in biological systems. In many cases, trends in electronegativity enable us to predict the type of bonding and the physical states in compounds involving the nonmetals. We know that electronegativity decreases as we move down a given group and increases as we move from left to right across a period. The nonmetals have higher electronegativities than do metals, and compounds formed between metals and nonmetals are generally ionic in nature because of the large differences in electronegativity between them. The metals form cations, the nonmetals form anions, and the resulting compounds are solids under normal conditions. On the other hand, compounds formed between two or more nonmetals have small differences in electronegativity between the atoms, and covalent bondingsharing of electronsresults. These substances tend to be molecular in nature and are gases, liquids, or volatile solids at room temperature and pressure. In normal chemical processes, nonmetals do not form monatomic positive ions (cations) because their ionization energies are too high. All monatomic nonmetal ions are anions; examples include the chloride ion, Cl, the nitride ion, N3, and the selenide ion, Se2. The common oxidation states that the nonmetals exhibit in their ionic and covalent compounds are shown in Figure 18.19. Remember that an element exhibits a positive... Q: When we move down a group of elements on the periodic table, what happens to their electronegativity? A:
****
A:
it decreases