In which of the following locations does carbon
remain free for the shortest time?
a. peat bogs
b. tropical forests
c. marshes
d. oceans
e. the arctic
Answer: b
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Specialized secretory cells centrally located in the brain in the third and fourth ventricles that produce CSF are called the:
a. choroid plexus. b. ventricles. c. meninges. d. pia mater.
Suberin is a waxy substance that is typically associated with the
a. primary xylem. b. root hairs. c. endodermis. d. tonoplasts. e. pericycle.
After replication of a DNA molecule is completed, two molecules are present: the original DNA and a
newly synthesized DNA. Indicate whether the statement is true or false.
When plants first colonized land, the space they occupied was two-dimensional: the surface of the land. Which adaptation allowed plants to occupy a three-dimensional environment?
A) double fertilization B) seeds C) vascular system D) flowers