According to the following reaction, which molecule is acting as a base? OH- + NH4+ ? H2O + NH3
A) H2O
B) NH3
C) OH-
D) NH4+
E) none of the above
C
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Net primary productivity is the
A) total amount of energy fixed for photosynthesis in an area, minus the energy wasted or used. B) for plant respiration and maintaining existing tissue. C) total amount of energy fixed for photosynthesis in an area. D) percentage of the total vegetation surface that is a healthy green color. E) ratio of the population of autotrophs to the population of heterotrophs in an ecosystem.
List an environmental problem caused by the building of a dam with regard to biodiversity.
What will be an ideal response?
Differentiation refers to the process in which the earth:
a. accreted from smaller terrestrial bodies b. was bombarded by frequent meteorite collisions c. became chemically segregated due to melting and sinking of iron d. became a separate and distinct planetary body along with the other terrestrial planets
The drier the air and the lower the relative humidity, the greater the evaporation rate will be
a. True b. False Indicate whether the statement is true or false