input: OPTIONS:
- carbon
- xenon
- oxygen
- helium Now, answer this question: Answer the following question given this paragraph: Within a nebula, there are varying regions where gravity has caused the gas and dust to clump together. The gravitational attraction of these clumps pull more atoms into the clump. As this accretion continues, the gas pressure increases and the core of the protostar gets hotter and hotter. If the protostar gets dense enough and hot enough, a fusion reaction will ignite and the star lights up. The minimum mass for the formation of a star is about 80 times the mass of Jupiter. A star is a very large, very hot ball of gas which has hydrogen fusing into helium in the core. Stars spend the majority of their life fusing hydrogen into helium. When the hydrogen is nearly used up, the star can fuse helium into heavier elements. Throughout this process, a battle goes on in the core of the star between gravity trying to collapse the star and temperature-produced gas pressure pushing the material in the star outward. During the life of a star, there is a balance between the gas pressure pushing out and gravity pushing in. Q: When the hydrogen is nearly used up, the star can fuse which element into heavier elements? A:
A:
output: helium

Answer the following question given this paragraph: Magma collects in magma chambers beneath Earth's surface. Magma chambers are located where the heat and pressure are great enough to melt rock. These locations are at divergent or convergent plate boundaries or at hotpots. Q: What area beneath the earth's surface do magma collects? A:

OPTIONS:
- hot chambers
- underneath chambers
- erosion chambers
- magma chambers

Answer: magma chambers

Problem: OPTIONS:
- algae
- pollen
- viruses
- bacteria
Q: Answer the following question given this paragraph: The Nitrogen Cycle Getting nitrogen into the living world is difficult. Plants and phytoplankton are not equipped to incorporate nitrogen from the atmosphere (which exists as tightly bonded, triple covalent N2) even though this molecule comprises approximately 78 percent of the atmosphere. Nitrogen enters the living world via free-living and symbiotic bacteria, which incorporate nitrogen into their macromolecules through nitrogen fixation (conversion of N2). Cyanobacteria live in most aquatic ecosystems where sunlight is present; they play a key role in nitrogen fixation. Cyanobacteria are able to use inorganic sources of nitrogen to "fix" nitrogen. Rhizobium bacteria live symbiotically in the root nodules of legumes (such as peas, beans, and peanuts) and provide them with the organic nitrogen they need. Free-living bacteria, such as Azotobacter, are also important nitrogen fixers. Organic nitrogen is especially important to the study of ecosystem dynamics since many ecosystem processes, such as primary production and decomposition, are limited by the available supply of nitrogen. As shown in Figure 46.17, the nitrogen that enters living systems by nitrogen fixation is successively converted from organic nitrogen back into nitrogen gas by bacteria. This process occurs in three steps in terrestrial systems: ammonification, nitrification, and denitrification. First, the ammonification process converts nitrogenous waste from living animals or from the remains of dead animals. Q: The nitrogen that enters living systems by nitrogen fixation is successively converted from organic nitrogen back into nitrogen gas by what? A:
Answer: bacteria

Problem:OPTIONS:
- hydrolysis
- digestion
- sexual reproduction
- photosynthesis

Answer the following question given this paragraph: Q: Chloroplasts are present only in cells of eukaryotes capable of what process? A:
****
A: photosynthesis

Answer the following question given this paragraph: Gas exchange is the movement of oxygen into the blood and carbon dioxide out of the blood. Q: In gas exchange, oxygen flows into the blood, and what flows out? A:
OPTIONS:
- naturally dioxide
- carbon monoxide
- liquid dioxide
- carbon dioxide
carbon dioxide

Answer the following question given this paragraph: For feeding, the insect head contains one pair of lower jaws and two pairs of upper jaws. Insects have also evolved a wide range of specialized mouthparts for eating certain foods. You can see some examples in Figure below . Q: How many pairs of upper jaws do insects have? A:
OPTIONS:
- four pairs
- six pairs
- three pairs
- two pairs

Answer:
two pairs