Why do peahens choose peacocks with the longest, showiest tails, when a long tail might be easily grabbed by a
predator?
What will be an ideal response?
ANSWER: Studies have shown the ability to survive despite the long tail is predictive of the survival and
health of offspring. The long tail is a handicap, so males that can thrive in spite of that
handicap apparently have excellent genetics.
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In order for a muscle contraction to occur, cross-bridges must form between structures within a muscle cell. These cross-bridges form between ______ and _____.
Fill in the blank(s) with correct word
The White Cliffs of Dover, a famous landmark in England, is made of limestone, which is really a collection of the pore-studdedshells (tests) of
A. spirochetes. B. diatoms. C. brown algae. D. foraminifera. E. dinoflagellates.
Females outnumber males in the tertiary sex ratio because genetic and ____________________ factors cause higher death rates among males
Fill in the blank(s) with correct word
The primary reservoir of the Mycobacterium responsible for leprosy is:
a. infected humans. b. infected animals. c. contaminated food. d. contaminated objects.