Which of the following is/are thought to be in part responsible for the evolutionary success of humans?
a. Humans possess strong opposable thumbs.
b. Humans walk upright.
c. Humans have complex brains, walk upright and have opposable thumbs
d. Humans walk upright and have opposable thumbs
e. Humans walk upright, have opposable thumbs, complex brains and can use tools
E
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Bacteria break down dead organisms into organic compounds. Therefore, they function as ____________________ in
the food web. Fill in the blank(s) with the appropriate word(s).
On June 21st, the Sun's declination is at
A) the equator. B) Rio de Janeiro, Brazil and Alice Springs, Australia. C) the Tropic of Capricorn. D) the Tropic of Cancer.
What complication does "duff" add to job of firefighters?
A. Duff makes a nearby larger fire appear to be less dangerous than it really is. B. Duff invisibly burns within the leaves of some plants. C. Duff can rain fire and embers down on unburned areas that are kilometers away. D. Duff allows fire to smolder in the soil and restart the fire again after it appears to be out.
Which plants can survive the seasonal fluctuations that occur year to year?
A. annuals B. spore producers C. seasonals D. cone producers E. perennials