Birds have
A. a backcurrent lung.
B. an air sac lung.
C. a parabronchial lung.
D. a negative pressure lung.
E. a tracheal lung.
C. a parabronchial lung.
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All living organisms use DNA as the genetic material
Indicate whether the statement is true or false
Which of these groups of algae could you potentially find in a high mountain lake?
a. red b. brown c. green d. cyanobacteria
Which of the following is not a characteristic of salps?
a. Free-swimming lifestyle b. Incurrent and excurrent siphons c. Radial symmetry d. Bioluminescence e. Filter-feeding
Which of the following statements is correct?
a. Offspring of two different true-breeding varieties are called hybrids. b. Mendel's pea plants could cross-fertilize but not self-fertilize. c. True-breeding plants are able to produce a variety of flower colors when self-fertilized. d. A genetic cross produces the P generation.