Residual chlorine must be maintained in
A) anaerobic sludge digestion.
B) primary sewage treatment.
C) secondary sewage treatment.
D) tertiary sewage treatment.
E) water treatment.
E
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For humans and most vertebrates, the body is supported primarily by ____
a. an exoskeleton b. only nonskeletal structures c. a hydrostatic skeleton d. an endoskeleton e. joined exo- and endoskeletons
People with autism have lower levels of _____, a hormone that contributes to bonding behavior in other mammals
a. oxytocin b. prolactin c. estrogen d. LH
Which organelle is enclosed by a double membrane?
a. ribosome b. nucleus c. lysosome d. peroxisome e. Golgi body
If tyrosine and isoleucine undergo condensation, the new bond that is formed is between the:a
oxygen of the R group and the hydrogen of the amino group. b. carbon of the R group and the nitrogen of the amino group. c. carbon of the carboxyl group and the hydrogen of the R group. d. carbon of the carboxyl group and the hydrogen of the amino group. e. carbon of the carboxyl group and the nitrogen of the amino group.