Most fishes are dioecious,with external fertilization and external development.
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Q3: Swimming is metabolically less expensive as a
Q4: At the latest,the early vertebrates branched into
Q5: Research by Hasler and others showed olfactory
Q6: The ray-finned fishes belong to the class
Q7: Sharks are heavier than water but achieve
Q9: One lineage of the neopterygian fishes gave
Q10: Hagfishes locate their food through keen vision.
Q11: The cartilaginous fishes are believed to have
Q12: The hagfishes are marine scavengers.
Q13: The chondrosteans are one group of the
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