Ques: Answer the following question given this paragraph: Ionic bonds tend to form between atoms for which the electronegativity differences are 2.0 and above. In general, ionic bonds between two atoms require one metal and one nonmetal. Q: Ionic bonds between two atoms require one metal and one what? Choices: - liquid - gas - metallic - nonmetal A:
Ans: nonmetal

Ques: Answer the following question given this paragraph: Glaciers and ice sheets are melting. This can be seen clearly in photographs. The glaciers advanced during the Pleistocene ice age. They have been melting back since then, except for during the Little Ice Age. However, the rate of melting has increased tremendously in recent decades. Q: Glaciers have been melting since what period? Choices: - industrial age - bronze age - stone age - pleistocene ice age A:
Ans: pleistocene ice age

Ques: Answer the following question given this paragraph: Leaf Structure and Function The outermost layer of the leaf is the epidermis; it is present on both sides of the leaf and is called the upper and lower epidermis, respectively. Botanists call the upper side the adaxial surface (or adaxis) and the lower side the abaxial surface (or abaxis). The epidermis helps in the regulation of gas exchange. It contains stomata (Figure 30.24): openings through which the exchange of gases takes place. Two guard cells surround each stoma, regulating its opening and closing. Q: The outermost layer of the leaf is the epidermis; it is present on both sides of the leaf and is called the upper and lower epidermis, respectively. botanists call the upper side the adaxial surface (or adaxis) and the lower side this? Choices: - dorsal surface - posterior surface - anterior surface - abaxial surface (or abaxis) A:
Ans: abaxial surface (or abaxis)

Ques: Answer the following question given this paragraph: Small streams often flow into bigger streams or rivers. The small streams are called tributaries. A river and all its tributaries make up a river system. Q: What do a river and all its tributaries make up? Choices: - abundance system - water system - food system - river system A:
Ans:
river system