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Science Ch. 2 Vocab

St. I's 4th Grade Science - Mrs. Engel

Backbone The main bone, made up of many small bones joined together, that runs along the middle of the back in some animals.
Exoskeleton A hard outer covering that supports and protects some animals without backbones.
Molt To shed an animal's outer covering.
Gills Organs for breathing found in fish and amphibians.
Amphibian One of a large group of animals with backbones that live part of their lives in water and part on land.
Reptile An animal with a backbone that has a dry, scaly skin.
Mammal An animal with a backbone that usually has hair on its body and feeds milk to its young.
Behavior The way a living thing acts.
Instinct A behavior that an animal is born with and does not need to learn.
Reflex A simple, automatic behavior.
Vertebrate Animals with back bones.
Invertebrate Animals with out back bones.
Cold Blooded Reptiles, amphibians, and fish are cold blooded animals that become hotter and colder, depending on the the temperature outside.
Warm Blooded Mammals and birds are warm-blooded, which means that they can make their own body heat even when it is cold outside.
Created by: beckystricker