Question

3 things in our body that protects us against harmful materials outside our body

Answer 1

Skin(protects us from micro organisms,cold/heat),
Leukocytes(WBC-kill's bacteria),
Enzymes in saliva(destroys some bacteria)

Answer 2

Liver destroys a lot of toxins-(poisonous substances)
Fat under the skin protect us from excessive cold temperature.
Sweat glands help in regulating body temperature.
Ceruminous glands in ear secrete a substance which prevent the growth of microorganisms.
Skull(cranium) protects our Brain from a majority of trauma.

Answer 3

Skin keeps bacteria and viruses out as well as temp control
Mucus keep bacteria out
Our fists protect us from bears

Answer 4

Eyes - to see bad stuff coming before it gets to you.
Hands - to knock bad stuff down and push it away.
Feet - to kick bad stuff or to run away from bad stuff.