Based on the temperature range and precipitation, which area in the accompanying figure is dominated by pine trees?
a. 3
b. 4
c. 5
d. 6
e. 7
e
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The extinction vortex
A. is what happens as a population decreases and becomes more vulnerable to extinction from a variety of causes. B. begins when one species in an ecosystem goes extinct and other species follow. C. is what happens when competing species fight over a single niche, often driving both species to extinction. D. is a spiral of events that occur once a species has become overcrowded through excess reproduction. E. is a spiral of events that includes introduction of competing species, overexploitation, and disease, in that order.
The pathway leading to the perception of sound by mammals begins with the _____
A) hair cells of the organ of Corti, which rests on the basilar membrane, coming in contact with the tectorial membrane B) hair cells of the organ of Corti, which rests on the tympanic membrane, coming in contact with the tectorial membrane C) hair cells of the organ of Corti, which rests on the tectorial membrane, coming in contact with the basilar membrane D) hair cells of the organ of Corti coming in contact with the tectorial membrane as a result of fluid waves in the cochlea causing vibrations in the round window E) hair cells on the tympanic membrane that stimulate the tectorial membrane neurons, leading to the auditory section of the brain
Genetic recombination ____
a. occurs in eukaryotes but not prokaryotes b. involves exchange between non-homologous regions of DNA c. results from asexual reproduction
d. decreases genetic diversity e. can occur in the absence of meiosis
Which of the following is an example of a positive feedback mechanism?
a. increase in body temperature when exposed to cold b. increased muscle contractions during labor c. decreased insulin production in response to low blood sugar d. increased respiration rate in response to decreased blood pH e. Both choices A and B are correct.