Answer the following question given this paragraph: Deformation of the ionic crystal causes one plane of atoms to slide along another. The resulting repulsive interactions between ions with like charges cause the layers to separate. Crystals tend to have relatively sharp, well-defined melting points because all the component atoms, molecules, or ions are the same distance from the same number and type of neighbors; that is, the regularity of the crystalline lattice creates local environments that are the same. Thus the intermolecular forces holding the solid together are uniform, and the same amount of thermal energy is needed to break every interaction simultaneously. Amorphous solids have two characteristic properties. When cleaved or broken, they produce fragments with irregular, often curved surfaces; and they have poorly defined patterns when exposed to x-rays because their components are not arranged in a regular array. An amorphous, translucent solid is called a glass. Almost any substance can solidify. Q: Why do crystals have relatively sharp and well-defined melting points? Choices: - particular intermolecular forces - variable intermolecular forces - angular intermolecular forces - uniform intermolecular forces A:
uniform intermolecular forces
(Question)
Answer the following question given this paragraph: Q: Bilaterally symmetrical animals have both dorsal and what type of sides? Choices: - exterior - anterior - posterior - ventral A:
(Answer)
ventral
Ques: Answer the following question given this paragraph: Natural Selection for a Polygenic Trait. Natural selection may affect the distribution of a polygenic trait. These graphs show three ways this can happen. Q: What evolutionary process may affect the distribution of a polygenic trait? Choices: - artificial selection - flow selection - characteristic selection - natural selection A:
Ans: natural selection
(Q).
Answer the following question given this paragraph: Like microscopes, telescopes use convex lenses to make enlarged images. However, telescopes make enlarged images of objectssuch as distant starsthat only appear tiny because they are very far away. There are two basic types of telescopes: reflecting telescopes and refracting telescopes. The two types are compared in the Figure below . They differ in how they collect light, but both use convex lenses to form enlarged images. You can learn more about telescopes and how they evolved in the video at this URL:. Q: Telescopes use which kind of lenses to enlarge images? Choices: - crystalline - spherical - concave - convex A:
(A).
convex
Ques:Answer the following question given this paragraph: Q: The distance between the crests of electromagnetic waves is called what? Choices: - trough - variation - crest - wavelength A:

Ans:wavelength
Question: Answer the following question given this paragraph: Q: What branch of science is the study of human origins? Choices: - biology - pharmacology - palaeobiology - paleoanthropology A:
Answer:
paleoanthropology