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10 terms

Science A2 Vocabulary

Terms and definitions for Chapter A2
STUDY
PLAY
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 dry, scaly skin
mammal
an animal with a backbone that usually has hair on its body and feeds milk to its young
reflex
a simple, automatic behavior
stimulus
the cause of a behavior
response
a behavior caused by a stimulus