What is the best way to clean the leaves of an indoor plant?
A) Wash with a diluted ammonia solution
B) Use a professional strength household cleaner
C) Wash with a fine spray of water
D) Wash with a heavy shower of water
C
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The ways in which a laser can be used for aligning systems are limited only by ____.
A. the power of motors B. the laws of light C. the ingenuity of the users D. light dispersion
?____________________ is used inside acetylene cylinders to absorb the gas and make it more stable.
Fill in the blank(s) with the appropriate word(s).
Give at least three examples of natural sources of outdoor air pollution. ____________ _____________ _____________
Fill in the blank(s) with the appropriate word(s).
Nitrification is a two-step process with nitrite (NO2-) being formed in step one and then nitrite being oxidized to nitrate (NO3-) in step 2. Which bacteria are responsible for step 1?
a. Nitrobacter b. Nitrosomonas