Scientists perform ____ in order to ____ a given ____
a. experiments; test; hypothesis
b. tests; experiment; law
c. tests; experiment; variable
d. facts; test; variable
e. hypotheses; try; experiment
ANSWER: a
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Water leaving an efficient wastewater treatment facility ideally has a biochemical oxygen demand (BOD) between ________ units
A) 50 and 100 B) 25 and 50 C) 5 and 25 D) 0 and 5
Which of the following statements reflects the second law of thermodynamics?
A. The energy of the starting materials for a reaction will equal the sum of energies of the products plus energy released as heat and disorder. B. The amount of useable energy resulting from a reaction will always be less than the total energy available in the starting materials. C. The entropy of the products of a reaction will always be greater than the entropy of the starting materials. D. The entropy of the starting materials for a reaction will always be greater than the entropy of the products
An inanimate object that harbors and transmits a pathogen is a ________.
A. vector B. source C. fomite D. reservoir E. carrier
What is a cirucmcision?
A) The surgical removal of the uterous B) The surgical sterilization of a male by cutting the vas deferens C) The surface removal of the foreskin of the penis D) The surgical sterilization of a female by blocking the oviducts