Carbon dioxide is the answer to the question
<h2>Option a) is correct</h2>
Explanation:
Growing improved crop plants that have nitrogen fixing enzymes
- Nitrate pollution occurs because of the introduction of excessive amounts of nitrogen to ground water and surface water
- Use of synthetic fertilizers has resulted in high levels of pollution and eutrophication of lakes and rivers
- When nitrogen fertilizers are leached deep down into the soil they cause serious pollution problems
- Plants that can do nitrogen fixation include members of family Fabaceae
- The symbiotic association between legumes and Rhizobium is the most important nitrogen fixing association; rhizobia bacteria convert nitrogen gas to ammonia and this process is called nitrogen fixation
Answer:
Main sequence stars change into giant star by exhausting their hydrogen supply.
Explanation:
This fact explain that main sequence stars change into giant star by exhausting their hydrogen supply. A main sequence star burns due to the presence of hydrogen in its core, because of this burning the main sequence reaching the end of its life cycle. Then the pressure of fusion reaction provides an outward thrust that expands the star many times larger than its original size, that leads to the formation of a red giant.
