Which of the following sequences correctly describes the movement of air in a bird's respiratory
system?
a. lungs; anterior air sacs; posterior air sacs
b. anterior air sacs; posterior air sac; lungs
c. posterior air sacs; lungs; anterior air sacs
d. lungs; posterior air sacs; anterior air sacs
e. anterior air sacs; lungs; posterior air sacs
C
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In addition to mutation, what other mechanism allows for new genetic information to be introduced into a population? Explain your answer.
What will be an ideal response?
Goiter is a disease characterized by an enlarged thyroid gland and results from (check all that apply)
_____ iodine deficiency in the diet _____ reduced levels of T3 in the blood _____ reduced levels of T4 in the blood _____ excessive thyroid-stimulating hormone production _____ excessive parathyroid hormone production
Although the placenta acts as a filter for many harmful substances, some are able to pass from mother
to embryo. They include a. alcohol. b. toxins in cigarette smoke. c. caffeine. d. drugs. e. all of these.
Why did Mendel choose pea plants for his research?
A. Pea plants are self-pollinating but can be cross-fertilized easily. B. Pea plants have a short generation time. C. Many true-breeding varieties were available. D. Peas are easy to cultivate. E. All of these were important characteristics in Mendel's selection.