A common generating force for surface waves in the oceans is:
a. wind.
b. gravity.
c. surface tension.
d. capillary action.
e. undersea tectonic activity.
A
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Referring to the illustration as a guide, if you were to put a stalk of celery into a mixture of water and food coloring, in which tissue would you expect to see the food coloring show later?
a. phloem
b. both xylem and phloem
c. xylem
d. none of these
Countercurrent exchange is a mechanism in which two adjacent currents flow in opposite directions and exchange materials. This mechanism can be found in
A. mammals. B. birds. C. fish. D. worms. E. sea anemones.
Which of the following is a structure adapted for seed dispersal by animals?
a. light, feathery plumes b. thick, indigestible seed coats c. air spaces and cork d. turgor pressure within fruits e. winged fruits
Suppose sugar is taken out of an excretory system tubule and put back into the blood. What would this process be an example of?
a. secretion b. release c. filtration d. reabsorption