Complete the sentence. The author MAINLY explains the importance of wind, nuclear and solar energy by... (A) emphasizing that these energy sources can only be created over millions of years.
(B) explaining how these energy sources are in danger of running out quickly.
(C) highlighting that these energy sources have been used since ancient times.
(D) suggesting that these energy sources can be used instead of burning fossil fuels.

can you give me more to work here with plzs and you

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.

during expiration the diaphragm relaxes, which causes the diaphragm to move downwards. the contraction of diaphragm increases the space for expansion of lungs. hence, the diaphragm relaxes and positioned downward during expiration.