| A | B |
|---|
| vertebrate | has a skull and backbone |
| five groups of vertebrates | fish, reptiles, amphibians, mammals, birds |
| largest group of vertebrates | fish |
| four body parts of vertebrate embryos | tails, hollow nerve cord, notochord, pharyngeal pouch |
| ectotherm | cold-blooded; body temperature changes |
| gills | what fish use to breathe |
| three groups of fish | jawless, bony and cartilage |
| swim bladder/oily liver | help fish stay afloat in water |
| lateral line system | tiny sense organs that detect vibrations in the water |
| internal fertilization | fertilization that occurs inside the body |
| amniotic egg | type of egg reptiles lay |
| alligator | broad, round snout |
| crocodile | round, pointed snout |
| yolk | provides food to embryo |
| albumen | provides protein and water to the embryo |
| allantois | stores waste of embryo |
| shell | protects the egg and keeps it from drying out |
| amphibian | double life |
| metamorphosis | change from larval form to adult form |
| endotherm | warm-blooded- body temperature stays constant |
| external fertilization | when a fish or amphibian lays an egg that is later fertilized by the sperm |
| steps in metamorphosis | 1. egg is fertilized 2. newly hatched tadpole breathes with gills 3. tadpole begins to grow legs. 4.tail and gills disappear 5. lungs become functional 6. adult frog |
| ecological indicator | can show the amount of pollution or the conditions of the environment |
