bilateral nervous system
bilateral nervous system
bilateral nervous system
bilateral nervous system
bilateral nervous system
bilateral nervous system
It could be a nervous dog or Chihuahua
nucleus and chloroplast
that the animal once had a use for that structure depending on where it lived. or that it decended from an animal that had that structure and used it.
a sponge does not have a nervous system
An insect is a type of animal. Any structure on an insect is, by definition, a structure on an animal.
The nucleus
Nervous tissue.