White blood cells: Structure: Able to change shape, Function: Protect the body by engulfing foreign invaders, Red blood cells: Structure: Small disc shaped and flexible, Function: Carry oxygen through small vessels to all parts of the body, Nerve cells: Structure: Long, thin and branched, Function: Quickly transmit messages throughout the body, Unicellular organisms: Do not contain specialized cells because they only contain 1 cell that must complete all functions for the organism to survive, Consist of 1 cell that is capable of carrying out all processes, Multicellular organisms: Made of more than 1 cell, Contain specialized cells that perform specific jobs in the body to help an organism survive, Fat cells: Structure: Tightly packed and able to swell, Function: Store energy for the body, Skeletal muscle cells: Structure: Able to contract , Function: allows for movement,

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