Fact 1: Secondary growth forms secondary vascular tissues and bark. Fact 2: Trees have the ability to undergo secondary growth and produce a woody body. Given the two facts above, what forms secondary vascular tissues and bark?
Available choices:
a). bamboo;
b). humans;
c). trees;
d). ferns;
e). fish;
f). phytoplankton;
g). plants;
h). oak;
c).