Q: A lewis acid is a substance that accepts a pair of electrons to form what? Read this paragraph and choose the correct option from the provided answers: Gilbert Lewis (1875-1946) proposed a third theory of acids and bases that is even more general than either the Arrhenius or Brnsted-Lowry theories. A Lewis acid is a substance that accepts a pair of electrons to form a covalent bond. A Lewis base is a substance that donates a pair of electrons to form a covalent bond. So, a Lewis acid-base reaction is represented by the transfer of a pair of electrons from a base to an acid. A hydrogen ion, which lacks any electrons, accepts a pair of electrons. It is an acid under both the Brnsted-Lowry and Lewis definitions. Ammonia consists of a nitrogen atom as the central atom with a lone pair of electrons. The reaction between ammonia and the hydrogen ion can be depicted as shown in the Figure below . Choices: - accretion bond - functionality bond - ambivalent bond - covalent bond A:
covalent bond

Q: Mushrooms and other fungi obtain energy from what? Read this paragraph and choose the correct option from the provided answers: Mushrooms and other fungi obtain energy from other organisms. That's why you often see fungi growing on a fallen tree; the rotting tree is their source of energy ( Figure below ). Choices: - the soil - the sun - the air - other organisms A:
other organisms

Q: Q: What is the name of the scientific field that deals with the general study of the solid earth? Read this paragraph and choose the correct option from the provided answers: Geology is the study of the solid Earth. Geologists study how rocks and minerals form. The way mountains rise up is part of geology. The way mountains erode away is another part. Geologists also study fossils and Earth's history. There are many other branches of geology. There is so much to know about our home planet that most geologists become specialists in one area. For example, a mineralogist studies minerals, as seen in ( Figure below ). Choices: - astronomy - physics - chemistry - geology A:
A: geology

Question: Q: What is the medial bone of the forearm that runs parallel to the radius? Read this paragraph and choose the correct option from the provided answers: Ulna The ulna is the medial bone of the forearm. It runs parallel to the radius, which is the lateral bone of the forearm (Figure 8.6). The proximal end of the ulna resembles a crescent wrench with its large, C-shaped trochlear notch. This region articulates with the trochlea of the humerus as part of the elbow joint. The inferior margin of the trochlear notch is formed by a prominent lip of bone called the coronoid process of the ulna. Just below this on the anterior ulna is a roughened area called the ulnar tuberosity. To the lateral side and slightly inferior to the trochlear notch is a small, smooth area called the radial notch of the ulna. This area is the site of articulation between the proximal radius and the ulna, forming the proximal radioulnar joint. The posterior and superior portions of the proximal ulna make up the olecranon process, which forms the bony tip of the elbow. Choices: - humerus - fibula - radius - ulna A:
Answer: ulna

*Question*
Q: Energy comes in discrete packages called what? Read this paragraph and choose the correct option from the provided answers: Energy comes in discrete packages called quanta. Choices: - quasar - quota - quasi - quanta A:
**Answer**
quanta

Q: What two types of hormones regulate mammalian reproduction? Read this paragraph and choose the correct option from the provided answers: 46.4 The interplay of tropic and sex hormones regulates mammalian reproduction. Choices: - tropic and subtropic - pheromones and enzymes - endorphins and adrenaline - tropic and sex A:
tropic and sex