The convergence in external morphology of
sharks, penguins, and porpoises is attributed to
a. reduced genetic variability in these groups.
b. selection pressures that are common to
these groups.
c. reproductive isolation of these groups.
d. identical genes in all three groups.
e. use and disuse of the limbs
B
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A trace element is one found in specific organisms in ____ quantities and is ____ for normal biological
functions.
a. moderate; unnecessary b. moderate; vital c. small; unnecessary d. large; unnecessary e. small; vital
Which of the following is a causative agent of a discharge disease?
A. Schistosoma haematobium B. Escherichia coli C. Leptospira interrogans D. Herpes simplex virus 2 E. Neisseria gonorrhoeae
Down syndrome involves trisomy
a. 3. b. 5. c. 15. d. 19. e. 21.
The number of ______ vary among species.
Fill in the blank(s) with the appropriate word(s).