What limits the length of a food chain? What will be an ideal response?
ANSWER: Energy transfers between trophic levels are not very efficient, so energy losses limit the
length of a food chain.
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In which stage of labor is the afterbirth (placenta, fluid, and blood) delivered?
a. the first stage b. the second stage c. the third stage d. in either the first or second stage e. in either the second or third stage
Which of the following sensations would involve a chemoreceptor?
A. taste B. smell C. vision D. Only vision and taste only are correct. E. Only smell and taste only are correct.
Which of the following is true of zinc?
a. It binds to most proteins in the body. b. Grains are the most reliable food sources of zinc. c. Excess zinc can decrease copper absorption. d. All of its functions involve it acting as a co-factor for enzymes.
In the early 1900s, cities such as Philadelphia reduced the incidence of typhoid fever by
A) isolating human carriers. B) using tertiary water treatment systems. C) filtering municipal drinking water through sand-bed filters. D) requiring residents to boil drinking water. E) mass vaccination of residents.