Answer the following question given this paragraph: Complex Tissue Structure A hallmark trait of animals is specialized structures that are differentiated to perform unique functions. As multicellular organisms, most animals develop specialized cells that group together into tissues with specialized functions. A tissue is a collection of similar cells that had a common embryonic origin. There are four main types of animal tissues: nervous, muscle, connective, and epithelial. Nervous tissue contains neurons, or nerve cells, which transmit nerve impulses. Muscle tissue contracts to cause all types of body movement from locomotion of the organism to movements within the body itself. Animals also have specialized connective tissues that provide many functions, including transport and structural support. Examples of connective tissues include blood and bone. Connective tissue is comprised of cells separated by extracellular material made of organic and inorganic materials, such as the protein and mineral deposits of bone. Epithelial tissue covers the internal and external surfaces of organs inside the animal body and the external surface of the body of the organism. Q: What term describes a collection of similar cells that had a common embryonic origin? Choices: - organ-level organization - plasma - nucleus - tissue A:
tissue
Answer the following question given this paragraph: Strategy: A Based on the conductivity of the elements, determine whether each is a metal, a nonmetal, or a semimetal. Confirm your prediction from its physical appearance. B From the compounds each element forms, determine its common oxidation states. C If the element is a nonmetal, it must be located in the p block of the periodic table. If a semimetal, it must lie along the diagonal line of semimetals from B to At. Transition metals can have two oxidation states separated by one electron. D From your classification, the oxidation states of the element, and its physical appearance, deduce its identity. Solution:. Q: Conductivity, oxidation state and physical appearance are properties that help determine whether what are metals? Choices: - atoms - phases - organisms - elements A:
elements
Q: Answer the following question given this paragraph: Chemists want to be able to predict the outcome of reactions. They would like it to be possible to predict what will happen when reactants are added together under a given set of conditions. The conditions of a reaction might include things like temperature, pressure, and concentrations of various reaction components. If the given conditions favor the formation of products, the reaction is said to be spontaneous . Q: How is a reaction described when the given conditions favor formation of products? Choices: - instantaneous - fluctuations - planned - spontaneous A:
A: spontaneous
Question: Answer the following question given this paragraph: A lake is an example of a freshwater biome. Water in a lake generally forms three different zones based on water depth and distance from shore. Q: A lake is an example of what type of biome? Choices: - natural biome - wet biome - organic biome - freshwater biome A:
Answer: freshwater biome
*Question*
Answer the following question given this paragraph: Whether or not a given isotope is radioactive is a characteristic of that particular isotope. Some isotopes are stable indefinitely, while others are radioactive and decay through a characteristic form of emission. As time passes, less and less of the radioactive isotope will be present, and the level of radioactivity decreases. An interesting and useful aspect of radioactive decay is half-life, which is the amount of time it takes for one-half of a radioactive isotope to decay. The half-life of a specific radioactive isotope is constant; it is unaffected by conditions and is independent of the initial amount of that isotope. Consider the following example. Suppose we have 100.0 g of tritium (a radioactive isotope of hydrogen). It has a half-life of 12.3 y. After 12.3 y, half of the sample will have decayed from hydrogen-3 to helium-3 by emitting a beta particle, so that only 50.0 g of the original tritium remains. After another 12.3 y making a total of 24.6 yanother half of the remaining tritium will have decayed, leaving 25.0 g of tritium. After another 12.3 ynow a total of 36.9 yanother half of the remaining tritium will have decayed, leaving 12.5 g. This sequence of events is illustrated in Figure 15.1 "Radioactive Decay". Figure 15.1 Radioactive Decay. Q: Some isotopes are stable indefinitely, while others are radioactive and do what through a characteristic form of emission? Choices: - replicate - bond - expand - decay A:
**Answer**
decay
(Question)
Answer the following question given this paragraph: Noninfectious diseases are not contagious because they are not caused by pathogens. Instead, they are caused by such factors as lifestyle choices, environmental toxins, or mutations. Q: Why are noninfectious diseases not contagious? Choices: - they are contagious - they are viral - they are inherited - non-pathogen caused A:
(Answer)
non-pathogen caused