The exchange surfaces of fish gills are arranged as rows of
A. lamellae.
B. trachea.
C. alveoli.
D. parabronchi.
E. spiracles.
A. lamellae.
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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.
The early Earth reducing atmosphere is thought to have lacked which of the following gases?
A. N2 B. O2 C. CO2 D. H2O E. SO4
What is the key concept addressed by the question?
What will be an ideal response?
Most xylem vessels in angiosperms consist of stacked vessel elements, water flows vertically through ____ and laterally through ____
a. phloem; xylem b. vessel elements; tracheids c. tracheids; vessel elements d. perforation plates; pits e. pits; plasmodesmata