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What is the term for animals that give birth to live young rather than laying eggs? What is the primary function of nephridia in annelids? What is the study of growing old is called? What is the primary function of hemolymph in arthropods? What term describes the evolutionary process by which two species gradually develop adaptations that allow them to coexist and reduce competition for resources? Which structure in the bird's digestive system is responsible for grinding food? Which hormone is secreted by the posterior pituitary gland and controls water balance in mammals? What type of symmetry is found in adult echinoderms like sea stars? Which of the following organ systems do echinoderms use for locomotion? Which type of cleavage pattern is characteristic of deuterosomes, such as echinoderms and chordates? Which of the following structures is unique to the respiratory system of birds? Which of the following classes of animals contains members with a cartilaginous skeleton? What is the main nitrogenous waste excreted by birds and reptiles? What is the function of chromatophores in cephalopods like octopuses? Scapula is the bone of Which of the following enzymes is responsible for breaking down proteins into amino acids in the stomach of vertebrates? Which of the following animal groups exhibits a closed circulatory system? What is the name of the larval stage of a frog? Which of the following animals is considered an example of an endothermic vertebrate? What is the major excretory product in aquatic animals like fish? Which taxonomic rank is placed immediately above family in the hierarchical classification system? In which group of animals is external fertilization most common? In insects, which part of the body is primarily responsible for gas exchange? What type of reproduction is found in honeybees, where males develop from unfertilized eggs? In mammals, what is the primary function of the diaphragm? What type of animal behavior is exemplified by the migration of monarch butterflies across North America? Which of the following is a characteristic of mammals but not of other vertebrates?