Deforestation:a
retards soil erosion.
b. releases carbon dioxide that may contribute to global warming.
c. has no effect on the extinction of biological species.
d. promotes the preservation of tropical birds.
e. is only a threat to tropical rain forests.
B
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Pigs have digitigrade locomotion because they walk on
(a) their ankles. (b) the soles of their feet. (c) the tips of their toes, which are modified as hooves. (d) their hands and knees.
The nerve gas Sarin kills by blocking
acetylcholinesterase, an enzyme that degrades acetylcholine. What effect does this have? a. ACh breakdown stops. b. It results in paralysis of skeletal muscles, confusion, and slurred speech. c. Signals for breathing may be disrupted. d. ACh breakdown stops, and signals for breathing may be disrupted. e. ACh breakdown stops; paralysis of skeletal muscles, confusion, headache, and possibly death
Sharks excrete a small volume of dilute urine
____________________ Indicate whether the statement is true or false.
What path does a molecule of O2 take from the nose to the respiratory surface?
A) pharynx ? larynx ? trachea ? bronchus ? bronchiole ? alveolus B) larynx ? pharynx ? trachea ? bronchus ? bronchiole ? alveolus C) pharynx ? larynx ? bronchus ? bronchiole ? alveolus ? trachea D) pharynx ? larynx ? trachea ? bronchiole ? bronchus ? alveolus