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Body systems are groups of organs and tissues that work together to perform important jobs for the body.

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Answer:

We can define body systems as groups of organs and tissues that work together to perform important jobs for the body.

...

Respiratory System. ...

Digestive System or Excretory System. ...

Cardiovascular or Circulatory System. ...

Renal System or Urinary System. ...

Endocrine System. ...

Nervous System.

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Answer: When groups of tissues work together, they are called organs.

Some examples are: the heart

                                           lungs

                                           skin

                                           stomach

When organs work together, they are called systems.

example:                   your heart

                                           lungs

                                           blood

                                    and blood vessels work together.

           

Explanation: Connective tissue holds the body together,

it is found in most organs.