Which wastewater treatment process is responsible for removal of most of the BOD in sewage?
A) anaerobic sludge digestion
B) primary sewage treatment
C) secondary sewage treatment
D) tertiary sewage treatment
E) water treatment
C
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The very young and the elderly are more susceptible to infectious disease
Indicate whether this statement is true or false.
The purpose of the distasteful odor emitted from the stinkhorn fern is to
a. attract flies. b. discourage predators. c. mimic another fungus. d. prevent plants from growing nearby.
Courtship is often dependent on what?
A. social releasers B. a stimulus/response chain C. an alarm call D. taxis E. size and colors
Why do electron microscopes have a better resolution versus light microscopes?
A) The additional steps necessary to prepare the sample for viewing provide the improved resolution. B) An electron beam has a wavelength of about 800 nm, and resolution improves with larger wavelengths. C) The lenses, knobs, and strength of the electron beam can all be highly controlled, which also explains why electron microscopes are so expensive. D) An electron beam has a wavelength of about 1 nm, and resolution improves with smaller wavelengths. E) The lenses used to focus the electron beam are more adjustable than the ones in a light microscope.