Low-growing, hardy plants of the ____________________ occur at high latitudes, where there is a layer of ____________________.
Fill in the blank(s) with the appropriate word(s).
arctic tundra; permafrost
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In what types of organisms do plasmodesmata serve as a mechanism of cell-cell communication?
A. protists B. plants C. those types of organisms that spend only a portion of their life cycle in a multicellular state D. animals
Natural selection is a process in which environmental pressures result in the differential ________ and ________ of individuals in a population
a. survival, physical features b. genetics, mutations c. survival, reproduction d. reproduction, mutations e. genes, mutations
Most O2 is transported in the blood
a. dissolved in the plasma. b. as bicarbonate ions. c. bound to hemoglobin. d. as carbon dioxide. e. bound to bicarbonate ions.
Are growth rates constant until K is achieved?
a. yes b. no