Fish were the first creatures with a. Bony skeletons
b. Eyes
c. Red blood
d. Ability to breathe oxygen

Which of the rock examples below is most likely to be metamorphic

If the coding part of an mrna molecule is 1800 nucleotides (bases) in length, this molecule will contain codons and code for a polypeptide that is amino acids long.

Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.