There are 64 codons and 20 amino acids. which of the following is true.
a: several different codons can specify the same amino acid.
b: each codon specifies a different amino acid
c: some amino acids have no link to a codon
d: each amino acid is specified by only one codon

(6.02 mc)what affect do marine protected areas have on environmental quality? they increase environmental quality by preventing resource overuse. they increase environmental quality by adding new species. they decrease environmental quality by removing all human activity. they decrease environmental quality by adding recycling facilities.

Analyze how the water cycle affects a food web. now list 3 examples for each below using complete sentences, on how too much water would affect the same web? how about to little water?

Which describes the changes in the earths motion?