The ____ closes the mouth of a mammal
Fill in the blank(s) with the appropriate word(s).
Answer: Masseter and temporalis
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External fertilization occurs in all of the following groups, except:
A. whales. B. frogs. C. salmon. D. perch. E. External fertilization occurs in all of the answer options.
Vertebrate bone consists primarily of a crystalline mixture of
A. Ca2+; SO4?2. B. Na+; Cl?. C. Ca2+; Cl2. D. Ca2+; PO4?2. E. Adenosine, PO4?2.
Which of the following statements is NOT true regarding the normal mechanism of ventilation?
Select one: a. There must be a continuous column of air from the pharynx to the alveoli. b. The lungs must lie within a sealed-off thoracic cavity. c. The inner and outer pleural membranes must be separated by a thin film of fluid. d. The intrapleural pressure must be greater than the atmospheric pressure. e. The diaphragm, when contracted, will be lowered.
It has been argued that cutting old-growth forests and replacing them with plantations of young trees would help to alleviate the threat of global greenhouse warming. What important fact does this argument ignore?
A) Forests play too minor a role in global CO2 dynamics, which are affected far more by marine algae. B) Young trees fix carbon at a lower rate per unit mass than old trees. C) Most of the biomass of the cut trees would be added to the atmosphere as CO2 within a few years. D) Most of the young trees would die within a few years.