Answer:
Bones. They are vertabrates, which means they have a backbone
Explanation:
Fish, reptiles, amphibians, birds and mammals all have bones
Answer:
hydroshpere and biosphere
Explanation:
it contains
hydrosphere: cleaning of water
biosphere: helps plants and animals
When you cut your hand your body reacts to it as a stimulus
So stimulus
I am sure the answer is repel because human hair carries negative charges which mean they will repel because like things repel