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Chapter 1
Life Sciences - A Look at Living Things
22
Science
3rd Grade
09/02/2010

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Term
organism
Definition
A living thing
Term
environment
Definition
All the living and nonliving things that surround an organism
Term
cell
Definition
The basic building block othat makes up all living things
Term
photosynthesis
Definition
The process through which plants make food
Term
vertebrate
Definition
An animal with a backbone
Term
invertebrate
Definition
An animal that does not have a backbone
Term
respond
Definition
To react to something
Term
reproduce
Definition
To make more of one's own king
Term
structure
Definition
A part of an organism
Term
root
Definition
A plant structure that takes in water and nutrients and holds a plant in place.
Term
nutrient
Definition
A substance that living things need to grow and stay healthy.
Term
stem
Definition
A plant structure that holds a plant up and helps leaves reach sunlight.
Term
leaf
Definition
Term
lung
Definition
A structure some animals use to take in oxygen from the air.
Term
gills
Definition
A structure some animals use to take in oxygen from water.
Term
shelter
Definition
A place in which an animal can stay safe.
Term
exoskelton
Definition
A hard covering, or shell, that holds up and protects an invertebrate's body.
Term
bird
Definition
A vertebrate that has a beak, feathers, wings, and two legs and lays eggs.
Term
reptile
Definition
A vertebrate that has scaly, waterproof skin, breathes air with lungs, and lays eggs.
Term
amphibian
Definition
A vertebrate that spends part of its life in water and part of its life on land.
Term
fish
Definition
A vertebrate that lives in water and breathes oxygen with gills.
Term
mammal
Definition
A vertebrate that has hair or fur, is born live, and feeds its young with milk.
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