Answer the following question given this paragraph: All amphibians have digestive, excretory, and reproductive systems. All three systems share a body cavity called the cloaca. Wastes enter the cloaca from the digestive and excretory systems, and gametes enter the cloaca from the reproductive system. An opening in the cloaca allows the wastes and gametes to leave the body. Q: The digestive, excretory, and reproductive systems of amphibians share a body cavity called what? Choices: - stoma - anus - urethra - cloaca A:
cloaca
(Question)
Answer the following question given this paragraph: Many flatworms are parasites with vertebrate hosts. Some are free-living carnivores that live mainly in aquatic habitats. Q: Some flatworms are free-living carnivores that live mainly in which type of habitats? Choices: - Deciduous forest - Desert - freshwater - aquatic A:
(Answer)
aquatic
Ques: Answer the following question given this paragraph: How high or low a sound seems to a listener is its pitch . Pitch, in turn, depends on the frequency of sound waves. Wave frequency is the number of waves that pass a fixed point in a given amount of time. High-pitched sounds, like the sounds of the piccolo in the Figure below , have high-frequency waves. Low-pitched sounds, like the sounds of the tuba Figure below , have low-frequency waves. For a video demonstration of frequency and pitch, go to this URL: http://www. youtube. com/watch?v=irqfGYD2UKw. Q: Dependent on the frequency of sound waves, what term described how high or low a sound seems to a listener? Choices: - curve - wavelength - direction - pitch A:
Ans: pitch
(Q).
Answer the following question given this paragraph: Q: Where are some of the greatest concentrations of species found? Choices: - at high altitudes - in the arctic - in mould colonies - in the tropics A:
(A).
in the tropics
Ques:Answer the following question given this paragraph: A solution is a mixture of two or more substances that has the same composition throughout. Some solutions are acids, some are bases. Q: Acidity is measured by what physical property? Choices: - k - ps - amp - ph A:

Ans:ph
Question: Answer the following question given this paragraph: Errors during DNA replication are not the only reason why mutations arise in DNA. Mutations, variations in the nucleotide sequence of a genome, can also occur because of damage to DNA. Such mutations may be of two types: induced or spontaneous. Induced mutations are those that result from an exposure to chemicals, UV rays, x-rays, or some other environmental agent. Spontaneous mutations occur without any exposure to any environmental agent; they are a result of natural reactions taking place within the body. Mutations may have a wide range of effects. Some mutations are not expressed; these are known as silent mutations. Point mutations are those mutations that affect a single base pair. The most common nucleotide mutations are substitutions, in which one base is replaced by another. These can be of two types, either transitions or transversions. Transition substitution refers to a purine or pyrimidine being replaced by a base of the same kind; for example, a purine such as adenine may be replaced by the purine guanine. Transversion substitution refers to a purine being replaced by a pyrimidine, or vice versa; for example, cytosine, a pyrimidine, is replaced by adenine, a purine. Mutations can also be the result of the addition of a base, known as an insertion, or the removal of a base, also known as deletion. Sometimes a piece of DNA from one chromosome may get translocated to another chromosome or to another region of the same chromosome; this is also known as translocation. These mutation types are shown in Figure 14.21. Q: What are the two methods in which mutations arise in dna? Choices: - produced or spontaneous - accelerated or spontaneous - accelerated or random - induced or spontaneous A:
Answer:
induced or spontaneous