C. their DNA is very different
Answer:
Nitrogen is the most commonly limiting nutrient in plants. Legumes use nitrogen fixing bacteria, specifically symbiotic rhizobia bacteria, within their root nodules to counter the limitation. Rhizobia bacteria convert nitrogen gas (N2) to ammonia (NH3) in a process called nitrogen fixation.
Answer:
I think it might be heart, lungs, blood, arteries, veins, and muscle cells
Explanation:
Pretty sure it would be the nerves attatched to the heart valve