Cycads may be characterized as being:a
dioecious and having nonmotile sperm.
b. dioecious and having motile sperm.
c. monoecious and having nonmotile sperm.
d. monoecious and having motile sperm.
e. the most primitive flowering plants.
B
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3.3 Assuming the same pressure gradient, flow through a vessel with a diameter of 100 m is _______ faster than through a tracheid of 25 m diameter
A. 4× B. 16× C. 64× D. 256×
A niche is
A. a place where an organism lives. B. the way an organism goes about living. C. a place where you put yourself. D. an animal that is able to slip through a narrow opening.
What is theprimary purpose of a phylogenetic tree?
a. The primary purpose of a phylogenetic tree is to be able to develop species and genus names of new discovered organisms. b. The primary purpose of a phylogenetic tree is to be able to trace evolutionary relationships amongst organisms. c. The primary purpose of a phylogenetic tree is to be able to determine which organisms are more advanced than others. d. The primary purpose of a phylogenetic tree is to be able to determine into which kingdom a living organism belongs.
Which type of antibody is involved in the allergic response?
a) IgM b) IgA c) IgE d) IgD.