How was the universe made? origin of the universe

Big Bang theory holds that our universe began 13.7 billion years ago, in a massive expansion that blew space up like a balloon, space is exapanding till this day, and will keep expanding.  

The study of the origin of the universe is called cosmology  

Explanation:

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.