Which wastewater treatment process produces BOD-containing effluent used for irrigation?
A) anaerobic sludge digestion
B) primary sewage treatment
C) secondary sewage treatment
D) tertiary sewage treatment
E) water treatment
C
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Which of the following is not a typical characteristic of K-selected plant species?
A. small size B. slow growth C. long life span D. few large seeds E. poor seed dispersal
Animals share a common origin with choanoflagellates
____________________ Indicate whether the statement is true or false.
Porpoises and some bats find their prey using sound waves in the _________range.
A. supersonic B. infrasonic C. ultrasonic D. high-pitched, human ear-audible E. low-pitched, human ear-audible
Which of these early terrestrial organisms is believed to have evolved vascular tissue?
A. gymnosperms B. conifers C. bryophytes D. ferns