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? A:
OPTIONS:
- biome level
- habitat level
- pH level
- trophic level

Answer: trophic level

Question: Answer the following question given this paragraph: Catalytic converters are used on motor vehicles. They break down pollutants in exhaust to non-toxic compounds. For example, they change nitrogen oxides to harmless nitrogen and oxygen gases. Q: Catalytic converters used on motor vehicles break down pollutants in what, yielding non-toxic compounds? A:
OPTIONS:
- muffler
- intake
- oil
- exhaust
Answer: exhaust

input with options: Answer the following question given this paragraph: Brain and spinal cord injuries most commonly occur because of car crashes or athletic activities. Fortunately, many injuries can be prevented by wearing seat belts and safety helmets (see Figure below ). Avoiding unnecessary risks, such as doing stunts on a bike or diving into shallow water, can also reduce the chances of brain and spinal cord injuries. Q: What are the two most common common ways that brain and spinal cord injuries occur? A:
OPTIONS:
- falls and surgical error
- sports and household accidents
- car crashes and falls
- car crashes and athletic activities
output: car crashes and athletic activities

Q: Answer the following question given this paragraph: Stomata are special pores that allow gasses to enter and exit the leaf. Q: Stomata are special pores that allow gasses to enter and exit what? A:

OPTIONS:
- the skin
- the flower
- the soil
- the leaf

A: the leaf

input: OPTIONS:
- isolated water
- clean water
- applied water
- strong water Now, answer this question: Answer the following question given this paragraph: Nitrogen Oxyacids and Salts Nitrogen pentaoxide, N2O5, and NO2 react with water to form nitric acid, HNO3. Alchemists, as early as the eighth century, knew nitric acid (shown in Figure 18.50) as aqua fortis (meaning "strong water"). The acid was useful in the separation of gold from silver because it dissolves silver but not gold. Traces of nitric acid occur in the atmosphere after thunderstorms, and its salts are widely distributed in nature. There are tremendous deposits of Chile saltpeter,. Q: Alchemists, as early as the eighth century, knew nitric acid as aqua fortis, which means? A:
A:
output: strong water

Question: Answer the following question given this paragraph: Autism has a wide phenotypic spectrum of disability. Twin studies have been instrumental in demonstrating an environmental component in autism. Q: Twin studies have been instrumental in demonstrating what type of component in autism? A:
OPTIONS:
- internal
- bacterial
- natural
- environmental
Answer:
environmental