Countries whose population is not growing have an age structure diagram that ____.
A. forms an inverted pyramid
B. forms a broad-based pyramid
C. has little variation in prereproductive and reproductive age groups
D. has a large pre-reproductive population
E. has a large reproductive population
Answer: C
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99% of all air is contained in the troposphere and stratosphere.
Answer the following statement true (T) or false (F)
What important characteristic of water is the blue color attributed to?
a. The large oxygen atoms b. The covalent bonds c. Adhesion to other solids d. The hydrogen bonds
Which of the following best represents primary recycling?
A) Collecting old clothing, cleaning it, and using the clothing to stuff new toy dolls B) Collecting newspapers and reusing them to make more newspaper C) Shredding plastic water bottles to make lawn furniture D) Recycling plastic garbage bags to make decking and railing materials
Which of the following enzymes is found in the stomach?
A) carboxypeptidase B) chymotrypsin C) pepsin D) trypsin