Jake is a farmer who owns horses and cattle. How often should jake deworm his animals to keep them healthy
А. once every two years
B. once a year
C. four to six times a year
D. once a week

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.

a compound light microscope is used to magnify objects in steps.  

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its b. greenhouse gasses trap uv rays for heat so that the plants stay alive.