Answer the following question given this paragraph: In the Bohr model, the atom is viewed as a densely packed nucleus comprised of neutrons and protons that is surrounded by electrons at fixed distances, which correspond to specific energy levels. However, the quantum model showed that the distances between electrons and the nucleus are not really fixed. Due to their wave-like nature, we cannot pinpoint the exact location of an electron that is in motion, but we can determine the probability that a given electron will be in a particular region in three-dimensional space. Schrdinger's equations are used to determine the position of a specific electron with respect to a nearby nucleus. The region in space in which an electron is most likely to be found is referred to as an orbital . Q: Which atomic model shows that the distances of electrons from the nucleus is not a fixed value? Choices: - the electron model - the distance model - the equivocation model - the quantum model A:
the quantum model
(Question)
Answer the following question given this paragraph: The transition metals are an interesting and challenging group of elements. They have perplexing patterns of electron distribution that don't always follow the electron filling rules. Predicting how they will form ions is also not always obvious. Q: What kind of metals have perplexing patterns of electron distribution that don't always follow the electron filling rules? Choices: - solution - transformation - variating - transition A:
(Answer)
transition
Ques: Answer the following question given this paragraph: Sponges come in a variety of shapes and sizes. For example, they may be shaped like tubes, fans, cones, or just blobs. They range in diameter from about a centimeter (0.4 inches) to over a meter (3.3 feet). Many species live in colonies that may be quite large. Adult sponges are sessile . This means they are unable to move from place to place. Root-like projections anchor them to solid surfaces such as rocks and reefs. Q: What is it called when something is unable to move from place to place? Choices: - Undrate - obovate - ovate - sessile A:
Ans: sessile
(Q).
Answer the following question given this paragraph: Hundreds of species of birds have gone extinct as a result of human actions. A well-known example is the passenger pigeon. It was once the most common bird in North America, but over-hunting and habitat destruction led to its extinction in the 1800s. Habitat destruction and use of the pesticide DDT explain the recent extinction of the dusky seaside sparrow. This native Florida bird was declared extinct in 1990. Q: Which single most factor is responsible for the extinction of hundreds of species of birds? Choices: - diet - animal actions - habitat - human actions A:
(A).
human actions
Ques:Answer the following question given this paragraph: Plant-like protists are commonly called algae (alga, singular) . Some algae consist of single cells. They are called diatoms. Other algae are multicellular. An example is seaweed. Seaweed called kelp can grow as large as trees. You can see both a diatom and kelp in Figure below . Algae are probably ancestors of plants. Q: Plant-like protists are commonly called what? Choices: - fungus - sponge - seaweed - algae A:

Ans:algae
Question: Answer the following question given this paragraph: The most noticeable magnetic activity of the Sun is the appearance of sunspots. Sunspots are cooler, darker areas on the Sun's surface ( Figure below ). Sunspots occur in an 11 year cycle. The number of sunspots begins at a minimum. The number gradually increases to the maximum. Then the number returns to a minimum again. Q: What is the name for the cooler, darker areas on the sun's surface? Choices: - corona - aurora borealis - anomalies - sunspots A:
Answer:
sunspots