Of the following list, which two factors are the main sources of differences among humans? 1. genetic variation 2. behavioral differences 3. differences in metabolism 4. environmental differences
A. 1 & 2
B. 1 & 4
C. 2 & 4
D. 3 & 1
B
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One of the two strains of Streptococcus pneumoniae isolated in the 1920s was surrounded by a ____________________, giving it the ability to evade the immune system and cause pneumonia
Fill in the blank(s) with correct word
Approximately _____ percent of all fungi are yeasts
a. 1 b. 25 c. 50 d. 99
What raises the pH of chyme so that digestive enzymes can function in the small intestine?
a. bicarbonate b. pepsin c. gastrin d. bile e. brush border enzymes
Tree rings represent growth during wet and dry periods of the year. In a deciduous tree found in the north, which two seasons would contribute to tree rings?
A. summer and fall B. winter and summer C. winter and spring D. spring and fall E. spring and summer