Answer: O many celled organisms
Explanation:
C. Protons and electrons must be equal as protons have a + charge and electrons are - so they cancel out
Look at some up some videos about like eureka math or khan Academy
My Answer: Vestigial organs
Why?: " Vestigial organs are physical structures that were fully developed
and functional in an ancestral group of organisms but are reduced
and unused in the later species."
Hope I helped! :D
CENTRAL NERVOUS SYSTEM INCLUDES THE BRAIN AND SPINAL CORD.
