What is the function of chromatophores in cephalopods like octopuses?


What is the term for animals that give birth to live young rather than laying eggs?


Which of the following structures is unique to the respiratory system of birds?


What is the major excretory product in aquatic animals like fish?


In which group of animals is external fertilization most common?


What is the primary function of hemolymph in arthropods?


In mammals, what is the primary function of the diaphragm?


Which of the following organ systems do echinoderms use for locomotion?


What is the main nitrogenous waste excreted by birds and reptiles?