Q: The chloroplast integrates the two stages of what process? Read this paragraph and choose the correct option from the provided answers: Choices: - breathing - defacation - polarization - photosynthesis A:
photosynthesis

Q: In headwater streams, what plant process is mostly attributed to algae that are growing on rocks? Read this paragraph and choose the correct option from the provided answers: Abiotic features of rivers and streams vary along the length of the river or stream. Streams begin at a point of origin referred to as source water. The source water is usually cold, low in nutrients, and clear. The channel (the width of the river or stream) is narrower here than at any other place along the length of the river or stream. Headwater streams are of necessity at a higher elevation than the mouth of the river and often originate in regions with steep grades leading to higher flow rates than lower elevation stretches of the river. Faster-moving water and the short distance from its origin results in minimal silt levels in headwater streams; therefore, the water is clear. Photosynthesis here is mostly attributed to algae that are growing on rocks; the swift current inhibits the growth of phytoplankton. Photosynthesis may be further reduced by tree cover reaching over the narrow stream. This shading also keeps temperatures lower. An additional input of energy can come from leaves or other organic material that falls into a river or stream from the trees and other plants that border the water. When the leaves decompose, the organic material and nutrients in the leaves are returned to the water. The leaves also support a food chain of invertebrates that eat them and are in turn eaten by predatory invertebrates and fish. Plants and animals have adapted to this fast-moving water. For instance, leeches (phylum Annelida) have elongated bodies and suckers on both ends. These suckers attach to the substrate, keeping the leech anchored in place. In temperate regions, freshwater trout species (phylum Chordata) may be an important predator in these fast-moving and colder river and streams. Choices: - mitosis - symbiosis - reproduction - photosynthesis A:
photosynthesis

Q: Q: Which zone is located below 200 meters from the surface? Read this paragraph and choose the correct option from the provided answers: Below 200 meters is the aphotic zone. There are no primary producers here because there isn't enough sunlight for photosynthesis. However, the water may be rich in nutrients because of dead organisms drifting down from above. Organisms that live here may include bacteria, sponges, sea anemones, worms, sea stars, and fish. Choices: - epipelagic - observable zone - mesopelagic - aphotic zone A:
A: aphotic zone

Question: Q: Where is the pressure of gases in the atmosphere at its greatest? Read this paragraph and choose the correct option from the provided answers: The pressure of gases in the atmosphere is greatest at sea level and decreases rapidly as altitude increases. Choices: - stratosphere - core - mountain ranges - sea level A:
Answer: sea level

*Question*
Q: Inside a cylinder, thermal energy is converted to what type of energy of the moving piston? Read this paragraph and choose the correct option from the provided answers: Thermal energy is converted to the kinetic energy of the moving piston inside the cylinder. The moving piston, in turn, can be used to turn a turbine or do other useful work. Choices: - residual energy - horsepower - electrochemical energy - kinetic energy A:
**Answer**
kinetic energy

*Question*
Q: A supervolcano that may have killed all but 10,000 humans resulted in what phenomenon, lasting up to a decade? Read this paragraph and choose the correct option from the provided answers: A supervolcano eruption took place at Lake Toba in northern Sumatra about 75,000 years ago ( Figure below ). This was the largest eruption in the past 25 million years. As much as 2,800 cubic kilometers of material was ejected into the atmosphere. The result was a 6- to 10-year volcanic winter. Some scientists think that only 10,000 humans survived worldwide. The numbers of other mammals also plummeted. Choices: - volcano fall - volcanic summer - volcano spring - volcanic winter A:
**Answer**
volcanic winter