| A | B |
|---|
| scales | helps protect fish |
| gills | takes in oxygen from water |
| inherit | to receive features from parent |
| birds | animals that have feathers |
| reptiles | land animals that have scales |
| amphibians | live first in water then on land |
| fish | live only in water |
| mammals | feed their young with milk |
| trait | feature that an animal is born with |
| fossil | evidence of a plant or animal from long ago |
| extinct | one kind of organism is gone forever |
| threatened | organism whose numbers are going down |
| species | scientific name |
| endangered | species that may become extinct |
| migrate | travel from one place to another and back again |
| camouflage | colors, patterns, etc. that help an animal blend in with the environment |
| mimicry | imitating the features of another animal to keep predators away |
| instincts | behaviors that an animal knows how to do |
| hibernate | go into a deep sleep during winter months |
| metamorphis | process that takes place when a tadpole changes into a frog |
