Multiple Choice
The respiratory system of birds is one of the most effective respiratory systems of all air-breathing organisms, due to its system of air sacs connected to the lungs. Which of the following can be inferred about the air sacs given the observation that they are neither thin nor highly vascularized?
A) They must not belong to the respiratory system.
B) They cannot be derived from endoderm.
C) They are not efficient sites of gas exchange between air and blood.
D) They cannot effectively moisturize the air before it reaches the lungs.
Correct Answer:
Verified
Correct Answer:
Verified
Q18: Female birds lay their eggs, thereby facilitating
Q19: Which of these structures would most likely
Q20: Living vertebrates can be divided into two
Q21: Which of the following statements about human
Q22: Which of the following is most likely
Q24: Which extant chordates are most like the
Q25: A team of researchers has developed a
Q26: Which structure of the amniotic egg most
Q27: Use the following information to answer the
Q28: What group of mammals display the following