Sedimentation of sludge occurs in
A) anaerobic sludge digestion.
B) primary sewage treatment.
C) secondary sewage treatment.
D) tertiary sewage treatment.
E) water treatment.
B
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What does a half-shaded circle represent on a pedigree chart?
A) a female carrier B) a female who does not have an allele for the genetic disorder represented C) a male who is affected by the genetic disorder represented D) a male carrier
Which fact correctly distinguishes the archaea from other organisms?
A) They are the only prokaryotic organisms. B) They evolved from modern-day eukaryotes. C) They have cell walls composed of unique polysaccharides. D) They live in moderate environments. E) They are the only group that lacks organelles.
Birds follow a herd of water buffalo to catch insects that are disturbed as the large herbivores walk through the grass. When large predators are near, the birds fly into the air and make warning calls. Who are the birds warning?
A) Other birds, who also catch insects stirred up by the water buffalo B) The water buffalo, so they can avoid attack C) Their competitors D) The predators, so they know their prey, the water buffalo, is near E) The water buffalo's prey, because they need to escape
The hypothesis that life developed from nonliving matter is known as:
a. abiotic evolution. b. chemical evolution. c. natural selection. d. organic evolution. e. inorganic evolution.