By a __________, transpiration pulls water upward by creating a continuous negative pressure (or
tension) inside xylem from leaves to roots. Fill in the blank(s) with the appropriate word(s).
cohesion-tension theory
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Which of the following respiratory tract defenses is mismatched?
A. Ciliary escalator - first line of defense B. IgA antibody - third line of defense C. Mucous membranes - third line of defense D. Nasal hairs - first line of defense E. Complement - second line of defense
Monophyletic groups contain all the species that evolved from a common ancestor
Indicate whether the statement is true or false
What major agricultural innovation in the early twentieth century allowed for production of far more food on arable land?
A) genetically modified crops B) concentration of carbon fertilizer C) industrial nitrogen fixation D) use of fish as fertilizer E) the discovery of crop rotation
In which period did the number of species increase most rapidly?
a. 0 to 20 years b. 20 to 40 years c. 40 to 60 years d. 60 to 100 years e. 100 to 160 years