Which of the following is an example of an Si unit? A)foot B) Second C) Pound D) gallon

the index of refraction of the second medium is higher. i just took the test trust me !

a community that experiences major changes undergoes progress

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides