The protective structure where egg cells are formed in bryophytes and seedless vascular plants is the
a. antheridium.
b. stoma.
c. strobilus.
d. sporangium.
e. archegonium.
E
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Some marine species of cyanobacteria
A. do not have flagella and are, therefore, nonmotile. B. do not have flagella but are, nonetheless, motile by some unknown mechanism. C. do not have flagella but are motile by means of pseudopods. D. have flagella and are, therefore, motile.
The central sulcus partially separates the frontal lobes from the temporal lobes
____________________ Indicate whether the statement is true or false.
Which of the following water features is(are) directly affected by eutrophication?
A. Lake Erie B. Gulf of Mexico C. Chesapeake Bay D. All of the above are correct. E. None of the above are correct.
Which of the following statements about energy is incorrect?
A. Chemical bonds store potential energy. B. All forms of energy can be converted to heat. C. A boulder perched on a hill has kinetic energy. D. Energy is defined as the ability to do work. E. The biological world gets its energy from the sun.