I believe, from my understanding, that Producers take up nitrogen to make amino acids.
It must be a producer as they are often plants in the soil, also, legumes do take up nitrogen, but 'fix' it into ammonia (N2 + 8H+ + 8e− → 2NH3 + H2) via Rhizobia bacterium.
The pulmonary artery
The pulmonary artery carries deoxygenated blood to the lungs.
I don’t know if I understand this myself, but I know that the dependent variable would be the Mitochondria thing, but I don’t know what the operational definition is. Anyway, I’m only in 7th grade, I’ll research this stuff.
Answer:
हिंदी में खोजें
मानव द्वारा उपयोग किए जाने वाले चार विभिन्न प्राथमिक ऊर्जा संसाधनों की सूची बनाएं
<em><u>Crude oil, coal, wind and natural gas are all primary energy sources. Electricity is not a primary energy source, it's an energy currency (see electricity as an energy currency for an in depth discussion). Likewise, secondary fuels are also energy currencies and aren't primary energy sources, they must be made.</u></em>
Adenine always pairs with Thymine, and Cytosine always pairs up with Guanine in DNA. When dealing with RNA, however, Uracil replaces Thymine. So in RNA, A pairs with U and C pairs with G. (just a fun fact) :)