Ocean exploration is limited by
a. lack of technology
b. expense
c. favorable weather conditions
d. all of the above

In dna, only the_ varies from one nucleotide to another. base phosphate sugar amino acid

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.

What can be said about farmers in highly developed countries? a) they have little or no negative impact on the environment. b) they practice subsistence agriculture. c) they are able to incorporate polyculture into their farming practices. d) they utilize organic farming techniques on a regular basis. e) they rely on large amounts of energy from fossil fuels.