In the accompanying figure, the pair of organisms that have the most recent ancestor is:
a. 2 and 4.
b. 6 and 4.
c. 4 and 5.
d. 2 and 3.
e. 1 and 2
d
Biology & Microbiology
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Which organisms have a hydrostatic skeleton with a soft body wall?
a. sea anemones b. spiders c. lobsters d. crabs e. cheetahs
Biology & Microbiology
Which organism possesses a three-chambered heart?
a. human b. amphibian c. arthropod d. bird e. fish
Biology & Microbiology
In this generalized illustration of
gametogenesis, the four cells in the right column should be labeled a. sperm. b. eggs. c. ovum and three polar bodies. d. secondary spermatocytes. e. diploid.
Biology & Microbiology
An example of a second messenger is:
a. protein kinase A. b. an ion channel. c. cyclic AMP. d. GABA. e. insulin.
Biology & Microbiology