Answer the following question given this paragraph: Respiration is the exchange of gases between the body and the outside air. Q: What is the exchange of gases between the body and outside air? Choices: - metabolism - secretion - expulsion - respiration A:
respiration
(Question)
Answer the following question given this paragraph: Matter can exist in one of several different states, including a gas, liquid, or solid state. States of matter differ in the amount of energy their molecules have. When matter recycles, it changes state by gaining or losing energy. Q: When matter recycles and changes state what does it gain or lose by doing so? Choices: - density - volume - fuel - energy A:
(Answer)
energy
Ques: Answer the following question given this paragraph: Homologous chromosomes move toward opposite poles of a dividing cell during. Q: Homologous chromosomes move toward what poles? Choices: - interior - parallel - octogonal - opposite A:
Ans: opposite
(Q).
Answer the following question given this paragraph: Electronegativities generally increase from left to right across a period. This is due to an increase in nuclear charge because of the greater number of protons in the nucleus. Alkali metals have the lowest electronegativities, while halogens have the highest. Because most noble gases do not form compounds, they are generally not assigned electronegativity values. Note that there is little variation among the transition metals. Electronegativities generally decrease from top to bottom within a group due to the larger atomic size. Q: Why do electronegativities decrease from top to bottom? Choices: - smaller atomic size - larger atomic variation - larger electric pull - larger atomic size A:
(A).
larger atomic size
Ques:Answer the following question given this paragraph: Helium may seem to be an exception, since it has only two valence electrons. This has to do with the fact that the n = 1 energy level has one s orbital and no p orbitals. As a result, the first energy level can be completely filled by just two electrons. It is the presence of a filled valence shell that gives noble gases their unusual stability, not anything intrinsic about the number 8. In addition to helium, the first few elements such as lithium, beryllium, and boron, have a particularly stable configuration with a pair of valence electrons rather that an octet. Q: How many valence electrons does helium have? Choices: - Five - six - three - two A:

Ans:two
Answer the following question given this paragraph: Lactic acid fermentation converts the 3-carbon pyruvate to the 3-carbon lactic acid (C 3 H 6 O 3 ) (see Figure below ) and regenerates NAD + in the process, allowing glycolysis to continue to make ATP in low-oxygen conditions. Since there is a limited supply of NAD + available in any given cell, this electron acceptor must be regenerated to allow ATP production to continue. To achieve this, NADH donates its extra electrons to the pyruvate molecules, regenerating NAD + . Lactic acid is formed by the reduction of pyruvate. Q: What natural destructive element cuts away at rock forming river valleys? Choices: - sediment - lava - air - water A:
water