The extraembryonic membrane that sends blood vessels into the endometrium is the chorion
Indicate whether the statement is true or false
TRUE
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48. If, according to one hypothesis, Najash evolved from terrestrial, burrowing snakes, which of the following best reflects the adaptive or selective benefit for other snakes to have lost their pelvis and hindlimbs?
A. In situations of flooded burrows and land surface, the snakes could swim better without hindlimbs and pelvis. B. Grasping prey would have been easier and more efficient without the hindlimbs and pelvis. C. Chasing prey through tunnels and burrows could be easier without the function and obstruction of hindlimbs and pelvis. D. Chasing prey would have been easier, because the snakes would be much faster without hindlimbs and pelvis. E. Burrowing snakes would be better able to dig their burrows without the hindlimbs and pelvis.
The risk of developing cancer can be decreased by:
a. increasing the amount of nitrates in the diet. b. exposing questionable tumors to x-rays. c. avoiding smoked, and salt-cured foods. d. examining the breasts and testes every two years. e. exposing neoplasms to UV radiation.
Beggiatoa are ________.
A. obligate aerobes B. microaerophiles C. obligate anaerobes D. facultative anaerobes
Which of the following immunoglobulins is produced by plasma cells in response to an allergen?
A) IgA B) IgD C) IgE D) IgG E) IgM