One source of fossil organisms in Precambrian rock formations is:
a. Yixian fossils.
b. Ediacarian fossils.
c. Burgess Shale fossils.
d. Chenjiang fossils.
e. index fossils
B
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Birds store food in a modified portion of the lower esophagus called the
A. crop. B. epiglottis. C. gizzard. D. alimentary canal. E. pharynx.
Saccharomyces cerevisiae is commonly referred to as
A. common bread mold. B. the "false morel." C. the "death angel." D. bread yeast. E. an antibiotic producer.
Which of the following metabolic processes involves enzymes located in the membranes of mitochondria?
A. glycolysis B. Krebs cycle C. electron transport system D. All of these answers are correct.
Scientists disagree about how many species are currently on earth for all of the following reasons EXCEPT:
a) there is controversy over whether natural selection is the only mode of speciation. b) there is not one true definition of species. c) at any one time, there are few populations in the process of speciation. d) there are many organisms on Earth that have yet to be discovered. e) different scientists use different techniques to estimate the actual number of species from the known number of species.