An effective means used early in the 19th century to clear water of the majority of bacteria was the use of

A. chlorine.
B. iodine.
C. alcohol.
D. sand filters


D. sand filters

Biology & Microbiology

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The letter "A" in the above figure represents

which teeth? a. incisors b. molars c. canines d. premolars e. none of these

Biology & Microbiology

Which elements are most often the limiting nutrients for plant growth?

A) nitrogen, potassium, phosphorus B) nitrogen, oxygen, hydrogen C) carbon, sodium, chlorine D) carbon, nitrogen, oxygen

Biology & Microbiology

The technique shown in Image B is most likely the:

a) Auramine-rhodamine b) PAS c) Kinyoun d) Thioflavin T

Biology & Microbiology

Which of the following transport mechanisms requires energy?

Biology & Microbiology