Toxic oil compounds' effects on the invertebrates include(s):
a. tainted flesh moving up the food chain.
b. all invertebrates are tolerant of oil pollution.
c. acting like a narcotic.
d. both a and c
D
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Phosphorus has ____ electron vacancies
a. 1 b. 2 c. 3 d. 5 e. 8
Fire in the dry shrublands does not kill the small bushy plants most probably because ____
a. these plants have a tough protective bark b. their leaves are typically inflammable c. they can resprout from roots d. the Forest Service puts the fires out quickly e. the tall trees provide canopy cover keeping the ground moist
The adrenal medulla is closely allied with this system?
A. True only for the sympathetic division B. True only for the parasympathetic division C. True for both divisions
The level of carbon dioxide in the blood is monitored by nerve tissue. If you exercise strenuously, the increase in cellular respiration consumes oxygen from the blood and produces surplus carbon dioxide removed in the blood. Since this physical exertion requires faster breathing to replenish oxygen supplies and carry away carbon dioxide, the carbon dioxide sensors result in signals from the brain to increase breathing rate. After you have rested, and carbon dioxide levels are back to normal, your breathing rate decreases too. This is an example of
A. a positive feedback loop that stimulates a response opposite to the stimulus. B. a response to a sensory impulse that causes a muscle or gland to react. C. the dynamic interplay between events that tend to change the internal environment and events that tend to keep it the same. D. a negative feedback loop that stimulates a response similar to the stimulus. E. the dynamic interplay between events that tend to change the internal environment and events that tend to increase the changes.