Fuels used in cars, and the carbon dioxide cars emit, were originally carbon dioxide
A. fixed by vascular and nonvascular plants during photosynthesis about 300 mya.
B. fixed in the tissues, decayed from dinosaurs after the Cretaceous mass extinction.
C. released from volcanoes, and accumulated over centuries.
D. trapped in rocks and compressed into oil and coal, during the Precambrian.
E. trapped in the ocean and secreted into large coral reef structures, during the Mesozoic.
A. fixed by vascular and nonvascular plants during photosynthesis about 300 mya.
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Fungi and protists serve an important role in the anaerobic digestion of cellulose in ruminants
Indicate whether the statement is true or false.
A new nucleotide can only be added to the ____ of a growing DNA strand. DNA therefore always grows in the _____ direction
A. 3'; 5' to 3' B. 5'; 5' to 3' C. 3'; 3' to 5' D. 5'; 3' to 5'
Erythropoietin is secreted by
a. pancreatic islet cells. b. the thyroid gland. c. the pituitary gland. d. the pineal gland. e. the kidneys.
Which of the following terms can be associated with many species of mollusks?
A. chelicerae B. pupa C. radula D. pen E. internal shell