Contamination of food by other living organisms is known as biological contamination.
Mikhail Gorbachev resigned as president of Soviet Union in December 1991 because the U.S.S.R. was dissolved in December 1991. He was the President of the Soviet Union from March 15, 1990 until December 25, 1991. The correct answer is A.
Answer:
Pulmonary circulation moves blood between the heart and the lungs. It transports deoxygenated blood to the lungs to absorb oxygen and release carbon dioxide. The oxygenated blood then flows back to the heart. Systemic circulation moves blood between the heart and the rest of the body.
Explanation:
Index fossils (also known as guide
fossils, indicator fossils or zone
fossils) are fossils used to define
and identify geologic periods (or
faunal stages).
Answer: The corret DNA sequence is ACUGCUAGCAU.
Explanation: The common mistake that they make is, they forget to replace thymine with uracil as a base pair of Adenine. During DNA transcription Thymine is replaced by Uracil in production of messenger RNA. Uracil is a de-mythylated form of thymine and requires less energy to produce.