Depending on their environments, animals may lose electrolytes (select all correct choices):
A. across the gills.
B. in sweat.
C. in urine.
D. in feces.
E. across the skin.
A,B,C,D,E
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Why are changes in the global carbon cycle important?
I) Burning reduces available carbon for primary producers and, therefore, primary consumers. II) Deforestation and suburbanization reduce an area's net primary productivity. III) Increasing atmospheric concentrations of carbon dioxide could alter Earth's climate. IV) By using fossil fuels we are destroying a nonrenewable resource. A) only I and III B) only II and IV C) only I, II, and IV D) only II, III, and IV E) only I, II, III, and IV
About ________ percent of the human genome sequence comes from retroviruses.
A) 4 B) 8 C) 12 D) 21
Viroids
a. are more complex than viruses b. have large DNA genomes c. encode their own polymerase for nucleic acid replication d. cause diseases in plants e. infect animal cells
__________ is the science of naming and classifying species. Fill in the blank(s) with the appropriate word(s)