What are two characteristics of all animals?

Multicellular or unicellular.

Explanation:

Some animals can be multicellular or unicellular. some animals are made up if cells that do not have cell walls too.

All animals are multicellular organisms.

All animals are heterotrophic.

Explanation:

All animals are multicellular because their bodies are made up of more than one cell.

All animals are heterotrophic because they get food and energy by consuming plants and animals.

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .

a physical change is being made.