Type the correct answer in each box spell all words correctly.
, and the part labeled b is a
the part labeled a is a

idk

explanation:

b. lithosphere, asthenosphere, mesosphere   is the answer most likely

i won't lie i don't know so go online and ask google thats what i do

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.