In final preparation for a climb up Mt. Everest, climbers take up residence at base camp for a period of days to weeks before the climb. During this time, the climbers must acclimate physiologically to the low oxygen levels. Out of a group of ten climbers, one is unable to acclimate to the low oxygen levels, so he cannot make the final part of the climb. What would explain his lack of acclimation?
A. The levels of erythropoietin in his system are too low.
B. The levels of hemopoietin in his system are too low.
C. The levels of renin-angiotensin in his system are too low.
D. The levels of adrenocorticotropin in his system are too low.
A. The levels of erythropoietin in his system are too low.
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Phorid flies are being used to combat the invasive red imported fire ants. How do phorid flies kill the ants?
a. They are predators of the ants. b. They produce a poison in their lining which kills the ants when eaten. c. They are parasitoids who lay their eggs in the ants body. d. They compete with the ants for food sources. e. They kill ant eggs.
Which of the following is the site where mature
sperm are stored? a. ureter b. urethra c. vas deferens d. bulbourethral gland e. epididymis
The waterproof cuticle covering the epidermis of land plants helps prevent dehydration, much like the skin of some land animals. As a consequence of having a cuticle, what other evolutionary adaptation was important for most land plants?
A. stomata in the leaves B. the endodermis in the root C. root hairs on the root epidermis D. trichomes on leaf surfaces E. collenchyma fibers just beneath the surface of the epidermis
In the figure below, what will be the equilibrium frequency of A1 on the island?
a. 0.3 b. 0.7 c. 0.8 d. 0.2 e. 0.1