Q: Nitrogen and sulfur oxides form what type of rain? Read this paragraph and choose the correct option from the provided answers: Both nitrogen and sulfur oxides are toxic to humans. These compounds can cause lung diseases or make them worse. Nitrogen and sulfur oxides form acid rain, which is described in the next concept. Choices: - common rain - toxic rain - heavy rain - acid rain A:
acid rain

Q: What is the study of ecosystems? Read this paragraph and choose the correct option from the provided answers: Ecology is the study of ecosystems. An ecosystem consists of all the living and nonliving components of the habitat. Whereas nutrients and certain elements are recycled through ecosystems, energy moves in just one direction. Many interactions among species within an ecosystem are centered around the flow of energy. The formation of ecosystems, from new land to current habitats, is usually based on the pioneer species, and these species are able to live in an area due to the nonliving factors, such as the climate, the soil and the amount of rainfall, of that area. The populations within an ecosystem also determine the stability of the system. Recent tremendous increases in the human population have raised many important ecological issues. Choices: - physics - botany - geology - ecology A:
ecology

Q: Q: Which generation of a plant is generally larger and longer-lived? Read this paragraph and choose the correct option from the provided answers: One of the two generations of a plant's life cycle is typically dominant to the other generation. Whether it's the sporophyte or gametophyte generation, individuals in the dominant generation live longer and grow larger. They are the green, photosynthetic structures that you would recognize as a fern, tree, or other plant (see Figure below ). Individuals in the nondominant generation, in contrast, may be very small and rarely seen. They may live in or on the dominant plant. Choices: - main generation - effective generation - alpha generation - dominant generation A:
A: dominant generation

Question: Q: What element do nuclear power plants use in fuel rods? Read this paragraph and choose the correct option from the provided answers: Nuclear power plants use uranium in fuel rods. The fuel rods become nuclear waste. Nuclear waste can be dangerous for hundreds of thousands of years. Choices: - plutonium - boron - magnesium - uranium A:
Answer: uranium

*Question*
Q: Why does photosynthesis not occur in the deep-water zone? Read this paragraph and choose the correct option from the provided answers: The deep-water zone is dark so there is no photosynthesis. Most deep-water organisms are scavengers. They feed on dead organisms that fall to the bottom of the lake. Crabs and catfish are two of these types of organisms. Fungi and bacteria are decomposers that live in the deep zone. Choices: - it is cold - it is pressurized - it is stagnant - it is dark A:
**Answer**
it is dark

Q: Q: Evidence for the presence of what on mars makes scientists think that life might have existed there in the past? Read this paragraph and choose the correct option from the provided answers: Curiosity, the rover, has found evidence of a flowing stream on Mars. Layers of smooth, water-polished pebbles have been photographed. This is exactly what you would see in a stream on Earth. There are many surface features that look like water-eroded canyons. Since there was liquid water on Mars, scientists think that life might have existed there in the past. One of Curiosity's tasks is to sample the soil to search for carbon and other evidence of life. Choices: - gas - plasma - air - water A:
A: water