Need with 2 biology questions

15. two different species belong to the same class. what other levels of classification do they have in common?

a. kingdom and genus
b. order and family
c. kingdom and phylum
d. family and genus

16. how do fungi get their food?

a. they absorb food from other organisms.
b. they decompose dead organisms.
c. they carry out photosynthesis.

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.