Most flowers produce both pollen and ovules
A. true
B. false
A
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Modifications of previous behavior based on experience represent
A. learning. B. fixed actions. C. external stimuli. D. adaptations.
In the lungs of cystic fibrosis patients, ____
a. chloride ions are stuck inside epithelial cells b. water is excessively abundant on epithelial surfaces c. epithelial surfaces are coated with slippery mucus d. excess water and chloride ions are pumped out of epithelial cells e. chloride ions are not transported out of epithelial cells, and epithelial surfaces are dry
Imported fire ants attack
a. humans. b. livestock. c. pets. d. wildlife. e. all of these.
The most common cause of extinction is
A) interactions with other species. B) limited species range. C) habitat change. D) overspecialization. E) asteroid impacts.