Answer the following question given this paragraph: There is a one problem when using food chains to accurately describe most ecosystems. Even when all organisms are grouped into appropriate trophic levels, some of these organisms can feed on species from more than one trophic level; likewise, some of these organisms can be eaten by species from multiple trophic levels. In other words, the linear model of ecosystems, the food chain, is not completely descriptive of ecosystem structure. A holistic modelwhich accounts for all the interactions between different species and their complex interconnected relationships with each other and with the environmentis a more accurate and descriptive model for ecosystems. A food web is a graphic representation of a holistic, non-linear web of primary producers, primary consumers, and higher-level consumers used to describe ecosystem structure and dynamics (Figure 46.6). Q: A problem with using food chains to describe ecosystems is that some organisms can feed on or be consumed by species from more than one of what level? Choices: - biome level - habitat level - pH level - trophic level A:
trophic level
Answer the following question given this paragraph: A: Acid rain dissolves and damages stone buildings and statues. The Figure below shows a statue that has been damaged by acid rain. Q: What type of rain dissolves and damages stone buildings and statues? Choices: - plastic rain - morning rain - stored rain - acid rain A:
acid rain
Q: 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:
A: sessile
Question: Answer the following question given this paragraph: Q: Potassium, calcium, and magnesium are considered what kind of nutrients? Choices: - micronutrients - minor nutrients - major nutrients - macronutrients A:
Answer: macronutrients
*Question*
Answer the following question given this paragraph: Think of a continent, like North America. Surrounding the continent are continental margins . Continental crust grades into oceanic crust at continental margins. Continental margins are under water. Almost all of North America sits on the North American Plate ( Figure below ). Both sides of the continent have continental margins, but each is very different. One continental margin of North America is an active margin. The other is a passive margin. Can you guess which is which?. Q: What does continental crust grade into at continental margins? Choices: - ocean floor - storm crust - remnants crust - oceanic crust A:
**Answer**
oceanic crust
(Q).
Answer the following question given this paragraph: It is hard to overstate the importance of hydrocarbons to modern life. Hydrocarbons have even been called the driving force of western civilization. You saw some ways they are used in Figure above . Several other ways are illustrated in Figure below . Their most important use is as fuels. Gasoline, natural gas, fuel oil, diesel fuel, jet fuel, coal, kerosene, and propane are just some of the hydrocarbon compounds that are burned for fuel. Hydrocarbons are also used to manufacture many products, including plastics and synthetic fabrics such as polyester. Q: What compounds, which serve as fuels and are used in manufacturing, are called the driving force of western civilization? Choices: - forests - fossils - gas - hydrocarbons A:
(A).
hydrocarbons