Which of the following respiratory adaptations evolved independently in several groups of aquatic invertebrates?
A) Hemocyanin
B) Hemoglobin
C) Tracheal system
D) Gills
E) Book lungs

Question

Which of the following respiratory adaptations evolved independently in several groups of aquatic invertebrates?  
A) Hemocyanin
B) Hemoglobin
C) Tracheal system
D) Gills
E) Book lungs

Quizplus · Accepted Answer

Gills have evolved independently in several groups of aquatic invertebrates, such as crustaceans, mollusks, and some insects. Hemocyanin (A) has evolved in some arthropods and mollusks, while hemoglobin (B) is found in vertebrates. Tracheal systems (C) have evolved in insects and some arachnids, and book lungs (E) are found in some arachnids.

Which of the Following Respiratory Adaptations Evolved Independently in Several