Answer:
A synapse.
Explanation:
This is where signals are transmitted through the brain, but cannot connect two neurons. The space is called a synapse.
DNA, Chromosomes, Nucleus, Cell, Organism
Explanation:
DNA makes up the Chromosomes, which are stored in the nucleus, which is the brain of the cell, and cells make up organisms.
Igneous rock.
Igneous rock forms from cooled and hardened magma or lava.