Which of the following mass extinctions is correctly matched with the date of the extinction?
A. Triassic-251 mya
B. Cretaceous-65.5 mya
C. Silurian-445.2 mya
D. Devonian-443.7 mya
Answer: B
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A) primary treatment B) secondary treatment C) tertiary treatment D) sludge digestion E) None of the stages of sewage treatment produce methane.
Uncoating of viral nucleic acid
A. does not occur in bacteriophage multiplication. B. occurs during penetration in the multiplication cycle. C. involves enzymatic destruction of the capsid. D. occurs before replication. E. All of the choices are correct.
The __________ deliver(s) nutrient-rich blood from
the small intestine to the liver. a. renal arteries b. hepatic portal vein c. abdominal aorta d. inferior vena cava e. coronary arteries
After years of experimentation and testing, it is possible to prove that a hypothesis is true, at which point it becomes absolute truth
Indicate whether the statement is true or false