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

Biology & Microbiology

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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?

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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

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Although the placenta acts as a filter for many harmful substances, some are able to pass from mother

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Why did Mendel choose pea plants for his research?

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Biology & Microbiology