Most scientists accept that the most probable
reason for the extinction of the dinosaurs was
a. the result of an asteroid impact.
b. the loss of food sources.
c. from being out-competed by mammals.
d. gas emissions from volcanoes.
e. giant tsunamis caused by earthquakes
A
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What would happen if you placed a trout (freshwater fish) into a saltwater tank at the aquarium and made some observations?
A. The fish would take on water quickly and get bloated. B. The fish would lose water and look wrinkled. C. The fish would take on water initially, but could reverse the direction of Cl– ion movement to deal with excess water. D. The fish would lose water initially, but could reverse the direction of Cl– ion movement to deal with excess water.
When systematists compare vertebrates to all other animals, the absence of a vertebral column is the ____ character
state and the presence of a vertebral column is the ____.
a. homologous; homoplasy b. ancestral; homology c. homologous; derived d. derived; ancestral e. ancestral; derived
What is the function of the vacuole in the cell?
a. It maintains water balance. b. It maintains correct ion balance. c. It provides a compartment in which toxic substances may be isolated. d. All of the above.
In nutrient-rich water, photosynthetic protists may
undergo population explosions known as __________. Fill in the blank(s) with the appropriate word(s).