Higher organisms use nitrogen to make their

a. nitrate
b. ammonia
c. plants
d. proteins
e. animals
f. denitrificating
g. waste

Which of the follow describes a disadvantage secondary sources have compared to primary sources?

Is dna the same in every cell in the human body explain your answer

Match the correct terms to their descriptions a system in which only energy but not matter is exchanged frozen water in snow part of geosphere that includes only soil a thin layer between the troposphere and the stratosphere cryosphere tropopause closed system pedosphere