Translation ends when:
a. the codon is missing.
b. trna detaches from mrna.
c. a stop codon is reached.
d. mrna leaves the nucleus.

C. a stop codon is reached.

Explanation:

Translation is the process by which proteins are synthesised from mRNA. It ends in the termination stage when a stop codon is encountered. Normally during translation the A-site of ribosome is responsible for binding the complementary codon on the mRNA with the incoming tRNA. The tRNA with the polypeptide chain is hold by the P-site.

During termination, a stop codon ( UAA, UGA or UAG) is encountered by the A site in ribosome and is then recognised by release factors. Release factors enter the P site and fit there leading to disassembly of entire ribosome/mRNA complex. A water molecule is added to the last amino acid of the chain which separates it from the tRNA molecule and leads to its release.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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producers: apple trees, potatoes, carrots, grains, acorns, cabbage, grass, corn, lettuce

consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls