What characteristics have made arthropods the most successful phylum? How these animals grow? Can you think of any disadvantage of growing this way?
· Arthropods are segmented, but not in the same way as annelids. They have clear segments have a pair of appendages attached. These appendages have articulation that was a successful evolutionary adaptation for arthropods. They are able to move and bend at specific joints on the animal. Each joint allows a full range of motion.
· Arthropods have an exoskeleton. This is a strong, lightweight outer covering made of chitin. An exoskeleton is form-fitting and moves with the animals.
· Arthropods developed lightweight striated muscles. This makes rapid movement possible.
· An arthropod grows by molting. The exoskeleton is shed at regular intervals. Once it is shed, the arthropod expands its tissues with water and grows a new shell.
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A farm field that has used only inorganic fertilizer for the past 20 years is most likely to have
A) fewer soil organisms and less soil structure but increased nutrient holding capacity. B) fewer soil organisms, less soil structure, and decreased nutrient holding capacity. C) more soil organisms, more soil structure, and increased nutrient holding capacity. D) more soil organisms, less soil structure, and decreased nutrient holding capacity.
What was an impact of NAFTA on Mexican farmers?
A) Hog production increased in Mexico, as U.S. swine producers went out of business. B) Corn prices fell in Mexico, since U.S. corn was heavily subsidized. C) Farm machinery in Mexico became impossible to maintain. D) The only profitable farms were those that had electricity. E) None of the above occurred.
Divergence and convergence of air are due to changes in
a. ?cloud pattern. b. ?solar radiation. c. ?radiational cooling. d. ?precipitation type. e. ?wind speed or wind direction.
Which of the following is most similar in volume to an acre-foot of water?
A. 9 football fields covered with one-tenth of a foot of water B. a square mile covered with 1 foot of water C. an acre covered with 3 feet (1 meter) of water D. 20 million gallons