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