Plastids originated from which of the following groups of prokaryotes?
A. Cyanobacteria
B. Spirochaetes
C. Proteobacteria
D. Archaea
E. Actinobacteria
A. Cyanobacteria
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Aquatic organisms are unable to tolerate low pH conditions mainly because acidic waters contain high concentrations of toxic
A) sodium. B) chlorine. C) aluminum. D) carbon dioxide.
Pyramids of numbers are of limited usefulness because they:a
do not indicate the biomass of the organisms at a given time. b. do not indicate the gross primary productivity of each species. c. do not include energy flow through the ecosystem. d. include three trophic levels. e. None of the answer choices is correct.
Of the following levels of organization, Archaea have
A) molecules only. B) atoms only. C) atoms and molecules. D) atoms, molecules, and organs. E) organs only.
The intensity of a message is determined by how many action potentials are generated within a given time.
Answer the following statement true (T) or false (F)