Why do things appear mainly black or white to us in low light?
A) Rods are more sensitive to light than are cones.
B) Colored light does not strike the retina in low light.
C) Only white light is available at night.
D) Few action potentials are generated in low light.
E) The diffused light of night does not fall on the fovea.
A
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In 1987, 18 black-footed ferrets, the last known individuals of this species, were captured and brought into a captive breeding program in Wyoming. In 1989, the total ferret population, still in captivity, was 120 animals
These 120 animals in 1989 represented: A. N, the total population size. B. N, the change in population size from 1987 to 1989. C. N/t, the rate of change in population size. D. r, the per capita change in population size. E. rN, the geometric rate of growth of the population.
Turtle hatchling survivorship rate is low in many turtle species due to predation. Amanda researched the predatory rate on a species of turtle eggs in the Red River. The eggs were harvested from trapped turtles and the egg's cloaca film (reproductive discharge) was either washed off or left on once gathered. Research suggests that predators use the female's cloaca scent to locate the eggs.The eggs were only handled when wearing gloves and then reburied along islands where the turtles were trapped. The nests were monitored by cameras and manually on foot and data on nest predation were recorded.Based on the experimental design, what is the independent variable?
A. Number of hatchlings B. Time eggs spent in ground C. No cloaca film on eggs D. Inducing egg laying
When the diaphragm and rib cage muscles relax
a. the chest cavity enlarges b. inspiration occurs c. expiration occurs d. it is impossible to breathe
Which of the following is NOT associated with a higher cancer risk?
a. hormone therapy b. safe sex c. smoking d. use of alcohol e. exposure to certain hazardous chemicals in the workplace