Answer the following question given this paragraph: When a series of straight waves strike an impenetrable barrier, the waves stop at the barrier. However, the last particle of the medium at the back corner of the barrier will create circular waves from that point, called the point source. This can be seen in the image below. This phenomenon is called diffraction , and it occurs in liquid, sound, and light waves. While the waves become circular waves at the point source, they continue as straight waves where the barrier does not interfere with the waves. Q: What is the phenomenon in which light and sound waves become circular at the point source of a barrier? Choices: - refraction - sonic wave - reflection - diffraction A:
diffraction
(Question)
Answer the following question given this paragraph: Superposition refers to the position of rock layers and their relative ages. Relative age means age in comparison with other rocks, either younger or older. The relative ages of rocks are important for understanding Earth's history. New rock layers are always deposited on top of existing rock layers. Therefore, deeper layers must be older than layers closer to the surface. This is the law of superposition . You can see an example in Figure below . Q: What is the position of rock layers and the relative ages called? Choices: - diffraction - metamorphism - bifurcation - superposition A:
(Answer)
superposition
Ques: Answer the following question given this paragraph: Examples of behaviors with annual cycles include migration and hibernation. Both are innate behaviors. They are triggered by changes in the environment, such as the days growing shorter in the fall. Q: Triggered by changes in the environment, migration and hibernation occur as cycles on what temporal basis? Choices: - bi-annually - seasonally - monthly - annual A:
Ans: annual
(Q).
Answer the following question given this paragraph: Group 14 is called the carbon group. This group contains two metalloids: silicon and germanium. Carbon is a nonmetal, and the remaining elements in this group are metals. Q: What is the name of the two metalloids in the carbon group called? Choices: - titantium and copper - silicon and gold - silver and gold - silicon and germanium A:
(A).
silicon and germanium
Ques:Answer the following question given this paragraph: Evolution that occurs over a long period of time is called macroevolution . It might take place over millions of years. This scale of evolution occurs above the level of the species. Fossils provide evidence for evolution at this scale. The evolution of the horse family, shown in Figure below , is an example of macroevolution. Q: What is evolution that occurs over a long period of time called? Choices: - spontaneous mutation - introgression - catabolism - macroevolution A:

Ans:macroevolution
Ques:Answer the following question given this paragraph: Q: What is the key issue in the small-population approach? Choices: - disease variation - genetic mutation - alternative variation - genetic variation A:

Ans:
genetic variation