Which one of the following illustrates intraspecific competition?
A) Male red-winged blackbirds defending nesting sites from other males
B) A Franklin's gull swooping down to snatch a fish from the water's surface
C) A tick and a flea sharing a dog's back
D) A butterfly feeding on the nectar of a daffodil flower
A
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Wind farms are viable options for supplying more of our energy needs in the future because:
a. high speed wind is a form of medium-quality energy b. high speed wind is a form of high-quality energy c. high speed wind is a form of low-quality energy d. all speeds of wind are high quality energy e. wind is not an energy form at all
During the 1950s, people lived on average more than two decades longer in developed countries than in developing ones. In the twenty-first century, the gap is ________
A) less than 5 years B) less than 10 years C) less than 15 years D) still the same E) increased to 30 years
A key that explains symbols used on a map is called a(n) ____________________
Fill in the blank(s) with correct word
Which common feature can weaken sedimentary rocks?
A. Bedding B. Foliation C. Coarse interlocking crystals D. Fossils