13). Atoms are the basic unit of matter
14). Elements (pure substances, one type of atom) and Compound (made up of two or more types of atoms)
16). Chemical change
17). If a rock is changed or broken and stays where it is, it is weathering. If pieces of pebbles and soil from the rock are moved by natural forces, it is erosion
Hope that helps
typically protista must not contain skull.
Answer:
The pebbles inside the rock.
Explanation:
The outside of the rock would've formed around the pebbles.
