Which of the following has exactly 3 significant figures?

A.  0.0451

Explanation:

To determine the amount of significant figures in numbers in science, it is important to follow specific rules:

Option A. 0.0451 has three significant figures: 4, 5, 1.

Option B. 450 has two significant figures: 4, 5.

Option C. 32.10 has four significant figures: 3, 2, 1, 0.

Option D. 370.0 has four significant figures: 3, 7, 0, 0.

Therefore, option A. 0.0451 is the correct answer.

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.