grade 4

the car motor work by natural gas or gasoline

• true

• false

the group of similar cells forms a organ

• true

• false

gas turbid lime water...

• carbon dioxide 

• oxygen 

• nitrogen 

gases exchange during inspiration occurs in ...

• nose

• mouth

• alveoli

bile juice digests ....

• fats

• sugar

• starch

force is measured by ....unit

• kilogram

• kilo meter

• newton

sun provides us with light only

• true

• false

solar heater changes the solar energy into electric energy

• true

• false

a common cavity that leads to esophagus and trachea is

• stomach

• pharynx

• small intestine

a closed path of electric current is electric circuit

• true

• false