_____ is one of the largest sources of chronic stress for adults.
A. Birth
B. Work
C. Christmas
D. Moving
Answer: B. Work
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Scientists want to determine whether chemical X, a component of fertilizer, is harmful to fish. They treat fish in the
laboratory with increasing amounts of the chemical for one week and then measure their viability. What is the experimental variable for this experiment?
a. chemical X b. fish c. river d. farming e. water
Which of the following is most likely the cause of the current extinction crisis?
a. asteroid impact b. human activity c. adaptive radiation d. tectonic activity e. rising sea levels
A layer of host cell membrane attached to a virus is called:
a. An envelope b. A protein coat c. A capsomere d. A capsid e. A plasmid
Which era saw the rise of seeds and pollen in plants?
A) Precambrian B) Cenozoic C) Paleozoic D) Cretaceous E) Mesozoic