Fishes. Chapter 24. I. Diversity. 26,000 living species—more species than all other vertebrate groups combined Adapted to live in a medium 800 x more dense than air Can adjust to salt and water balance of environment Gills extract oxygen from water that has 1/20 th the oxygen of air
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Whale shark reaches 43’ in length
Oviparous sharks and rays lay an egg capsule immediately after fertilization that attaches to kelp with tendrils; may take up to 2 years before mini adult hatches
Ovoviviparous sharks retain fertilized eggs in reproductive system where they are nourished by yolk of egg; “live” birth
Viviparous sharks nourish embryos with maternal bloodstream; “live” birth
Live births make it more likely more of the young survive but no other care is given after birthD. Reproduction and Development