Animal breeding: Media
animal husbandry
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Black Angus bull
The Black Angus breed is popular for its tender, marbled meat.
Henry Elder/Encyclopædia Britannica, Inc.
sow and piglets
Female pigs can have as many as 20 piglets in a litter. China holds the record for...
© Corbis
The arrangement of nucleotide bases within DNA
DNA structure, showing the nucleotide bases cytosine (C), thymine (T), adenine (A),...
Encyclopædia Britannica, Inc.
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