Answer the following question given this paragraph: Reproduction in prokaryotic cells is by binary fission ; a process of growth, enlargement and division. This will be discussed in the Cell Division: Prokaryotic (Advanced) concept. Q: Reproduction in prokaryotic cells is by what process of growth, enlargement and division? Choices: - mitosis - budding - photosynthesis - binary fission A:
binary fission
(Question)
Answer the following question given this paragraph: The head generally has several simple eyes and a pair of compound eyes. Simple eyes have a single lens, like the human eye. Compound eyes have many lenses. Q: Simple eyes, like the human eye, have how many lenses? Choices: - two - none - four - one A:
(Answer)
one
Ques: Answer the following question given this paragraph: Recall that terrestrial biomes are defined by their climate. That's because plants and animals are adapted for certain amounts of temperature and moisture. However, would aquatic biomes be classified in the same way? No, that wouldn't make much senseall parts of an aquatic environment have plenty of water. Aquatic biomes can be generally classified based on the amount of salt in the water. Freshwater biomes have less than 1% salt and are typical of ponds and lakes, streams and rivers, and wetlands. Marine biomes have more salt and are characteristic of the oceans, coral reefs, and estuaries. Q: How are aquatic biomes often classified? Choices: - depth - amount of life - amount of light - amount of salt A:
Ans: amount of salt
(Q).
Answer the following question given this paragraph: It is hard to overstate the importance of hydrocarbons to modern life. Hydrocarbons have even been called the driving force of western civilization. You saw some ways they are used in Figure above . Several other ways are illustrated in Figure below . Their most important use is as fuels. Gasoline, natural gas, fuel oil, diesel fuel, jet fuel, coal, kerosene, and propane are just some of the hydrocarbon compounds that are burned for fuel. Hydrocarbons are also used to manufacture many products, including plastics and synthetic fabrics such as polyester. Q: What compounds, which serve as fuels and are used in manufacturing, are called the driving force of western civilization? Choices: - forests - fossils - gas - hydrocarbons A:
(A).
hydrocarbons
Ques:Answer the following question given this paragraph: A compound is a unique substance that forms when two or more elements combine chemically. Compounds form as a result of chemical reactions. The elements in compounds are held together by chemical bonds. A chemical bond is a force of attraction between atoms or ions that share or transfer valence electrons. For a video introduction to compounds, go to this URL: http://www. youtube. com/watch?v=-HjMoTthEZ0 . Q: What type of reactions form compounds? Choices: - mineral reactions - consumption reactions - physical reactions - chemical reactions A:

Ans:chemical reactions
Ques: Answer the following question given this paragraph: Quantum-mechanical calculations suggest why the observed bond angles in H2O differ from those predicted by the overlap of the 1s orbital of the hydrogen atoms with the 2p orbitals of the oxygen atom. The mathematical expression known as the wave function, , contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals, LCAO, (a technique that we will encounter again later). The new orbitals that result are called hybrid orbitals. The valence orbitals in an isolated oxygen atom are a 2s orbital and three 2p orbitals. The valence orbitals in an oxygen atom in a water molecule differ; they consist of four equivalent hybrid orbitals that point approximately toward the corners of a tetrahedron (Figure 8.7). Consequently, the overlap of the O and H orbitals should result in a tetrahedral bond angle (109.5). The observed angle of 104.5 is experimental evidence for which quantummechanical calculations give a useful explanation: Valence bond theory must include a hybridization component to give accurate predictions. Note that orbitals may sometimes be drawn in an elongated "balloon" shape rather than in a more realistic "plump" shape in order to make the geometry easier to visualize. Q: This process of combining the wave functions for atomic orbitals is called what? Choices: - assimilation - hydration - activation - hybridization A:
Ans:
hybridization