Where did the first life on Earth evolve?
A. in the ocean
B. Scientists do not know.
C. on land
D. somewhere else in the universe
E. in a freshwater habitat
Answer: B. Scientists do not know.
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An egg of the organism of S. mansoni is isolated from the feces of an adult man who has been traveling in Africa. An unoperculated egg with a large lateral spine is recovered. The patient is administered the standard dose of praziquantel; however, his infection does not improve. Which one of the following statements explains this discrepancy?
a. Metrifonate should have been adminis-tered. b. Bilarcil is the drug of choice for this type of infection. c. Steroids should have been initially admi-nistered. d. A larger dose may be required to be effec-tive against this organism.
Air becomes deoxygenated during the ____ of a bird’s respiratory cycle
a. first inhalation b. first exhalation c. second inhalation d. second exhalation e. third exhalation
Facilitated diffusion of a molecule into a cell would be more rapid if the ________.
Fill in the blank(s) with the appropriate word(s).
Fossilized remains of humans and their immediate ancestors are found:a
only in rock formed from volcanoes. b. only in relatively young rock. c. in any rock from areas inhabited by humans. d. only in rock from the Precambrian times. e. only in relatively old rock