Changes in technology change the economic geography of a region
Indicate whether this statement is true or false.
TRUE
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What mechanism makes it difficult to classify bacteria into distinct species groups?
A. vertical evolution. B. horizontal gene transfer. C. sexual reproduction. D. asexual reproduction. E. low mutation rates.
What two types of melanin are made by
melanosomes?
a. brownish- black and yellowish b. brownish-black and reddish c. brownish-black and white-ish d. yellowish and reddish e. reddish and white-ish
Morphological or molecular characters shared by members of a clade are called ______
A) common ancestors B) paraphyletic groups C) homoplasys D) monophyletic groups E) synapomorphies
How is the stomach lining protected from the strongly acidic pH of its contents?
a. Mucous cells secrete a protective lubricant into the stomach. b. It releases a hormone called gastrin, which stops gastric juice secretion. c. Bile neutralizes the acid soon after it enters the stomach. d. Parietal cells secrete a protective buffer to neutralize hydrochloric acid. e. The acid is neutralized quickly when it combines with pepsinogen to make pepsin.