A ____________ is the basic unit of structure and function for all living things.

• skin

• cell

• eyes

• heart

A/an ___________________ is a group os tissues that work together to perform a specific job.

• organ

• cell

• skin

What kind of tissue makes your body move?

• nerve tissue

• connective tissue

• muscle tissue

• epithlial tissue

Which body system is responsible for making us breathe?

• digestive system

• immune system

• excretory system

• respiratory system

The main function of the respiratory system is to take in ______________ through the lungs and get rid of carbon dioxide and water.

• oxygen

• saliva

• water

• carbon dioxide

The excretory system helps ___________ wastes in the body.

• bring in

• get rid of

Which organ helps break down wastes into forms that can be excreted and recycles materials?

• kidneys

• liver

• lungs

Which body system eliminates pathogens and sicknesses from invading the body?

• excretory system

• nervous system

• immune system

• respiratory system

All of these are layers of the immune system EXCEPT:

• breathing passages

• mouth

• stomach

• skin

• heart

The brain is the main organ that is part of the _____________ system.

• nervous system

• immune system

• respiratory system

• digestive system