In single-gene traits, natural selection can lead to which of the following?

a. founder effect
b. directional selection
c. allele frequency change
d. disruptive selection

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate

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.

answer: dna

because all cells have genes