| A | B |
|---|
| endoskeleton | skeleton inside the body |
| notochord | strong, rodlike structure in chordates that can bend |
| vertebrate | animal with a backbone |
| chordate | animal that has a notochord at sometime during their development |
| cartilage | kind of strong, flexible tissue |
| coldblooded | having a body temperature that changes with the temperature of the surroundings |
| gills | organs that absorb dissolved oxygen from water |
| amphibian | animal that lives part of its life in water and part on land |
| caecilian | amphibian without legs |
| metamorphosis | changes during the stages of development of an organism |
| tadpole | larval stage of a frog |
| reptile | coldblooded, land animal that lay eggs |
| warmblooded | having a body temperature that remains about the same |
| bird | warmblooded animal with feathers |
| Salmonella | bacteria that can be found in the meat and eggs of poultry |
| mammary glands | glands where milk is produced in female mammals |
| placenta | structure in pregnant female placntal mammals that connects the mother and developing mammal |
| egg | female sex cell |
| fertilization | union of a male sex cell and a female sex cell |
| sperm | male sex cell |
