1. Explain why the common ancestor of the chordates s believed to have been an extinct
echinoderm.
12. Explain how hormones influence courtship and territorial songs in male birds.
13. Briefly account for the unique adaptations for buoyancy and osmoregulation in the class elasmobranchii.
14. Explain with examples how bird migration can affect human livestock health.
15. Illustrate the phylogeny of the major fish groups based on their morphology.
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