Which of these pathways best summarizes the route of a mineral that is absorbed by a plant?
A) Root hairs ? epidermis ? cortex ? endodermis ? pericycle ? xylem
B) Root hairs ? pericycle ? endodermis ? endodermis ? cortex ? xylem
C) Root hairs ? endodermis ? cortex ? pericycle ? xylem
D) Root hairs ? epidermis ? endodermis ? cortex ? xylem
E) Root hairs ? cortex ? epidermis ? phloem ? xylem
A
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How many heme groups does each hemoglobin molecule contain?
a. one b. two c. four d. eight
As wavelength increases, the associated energy
A. remains the same. B. increases. C. decreases.
Genetic traits that enhance survival tend to be passed from generation to generation. In the case of Colias eurytheme larvae, green larvae are camouflaged, and yellow larvae are easily spotted by predators. Over generations, you would expect:
A. the number of yellow larvae to increase, thus increasing the presence of the yellow gene in the population B. yellow larvae to decrease in numbers C. green larvae to be selected against D. both yellow and green larvae to develop a thicker skin so they are not as attractive to predators
A vasectomy involves cutting the _____________, which is probably easier to do in humans than it might have been because it evolved to be much __________ than it "needs" to be.
Fill in the blank(s) with the appropriate word(s).