Animals have a great variety of internal structures that define the way they live. for example, a bear has lungs to it get oxygen to all of its cells. what does a fish have that serves the same function? a. scales b. gills c. fins d. lungs

B

Explanation:

multiplying and dividing the two decimals and the eqations by the same number of the overalls

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.