Answer the following question given this paragraph: Many compounds form molecules, but ionic compounds form crystals instead. A crystal consists of many alternating positive and negative ions bonded together in a matrix. Look at the crystal of sodium chloride (NaCl) in the Figure below . The sodium and chloride ions are attracted to each other because they are oppositely charged, so they form ionic bonds. Q: What type of compounds can form crystals? Choices: - integral compounds - magnetic compounds - molecular compounds - ionic compounds A:
ionic compounds
(Question)
Answer the following question given this paragraph: Q: Structural adaptations in flying animals often contribute to reduced what? Choices: - blood flow - eyesight - respiration - body mass A:
(Answer)
body mass
Ques: Answer the following question given this paragraph: 2t = n / 2, 3 n / 2, 5 n / 2, . To know whether interference is constructive or destructive, you must also determine if there is a phase change upon reflection. Thin film interference thus depends on film thickness, the wavelength of light, and the refractive indices. For white light incident on a film that varies in thickness, you will observe rainbow colors of constructive interference for various wavelengths as the thickness varies. Example 27.7 Soap Bubbles: More Than One Thickness can be Constructive (a) What are the three smallest thicknesses of a soap bubble that produce constructive interference for red light with a wavelength of 650 nm? The index of refraction of soap is taken to be the same as that of water. (b) What three smallest thicknesses will give destructive interference? Strategy and Concept Use Figure 27.33 to visualize the bubble. Note that water). There is a. Q: Different types of interference include destructive and what else? Choices: - helpful - consistent - active - constructive A:
Ans: constructive
(Q).
Answer the following question given this paragraph: Some bacteria depend on other organisms for survival. For example, some bacteria live in the roots of legumes, such as pea plants ( Figure below ). The bacteria turn nitrogen-containing molecules into nitrogen that the plant can use. Meanwhile, the root provides nutrients to the bacteria. In this relationship, both the bacteria and the plant benefit, so it is known as a mutualism . Q: In biology, a relationship that benefits both entities is known as what? Choices: - naturalism - altruism - predatory - mutualism A:
(A).
mutualism
Ques:Answer the following question given this paragraph: Nearly all fish reproduce sexually and have separate sexes. Q: Nearly all fish reproduce sexually and have what? Choices: - modified sexes - flexible sexes - single sexes - separate sexes A:

Ans:separate sexes
Answer the following question given this paragraph: Q: What in saliva protects the lining of the mouth from abrasion and lubricates food for easier swallowing? Choices: - hairs - phloem - spores - mucus A:
mucus