Answer:
the 1st and 4th one. index fossils r imprints and also it is individual animals making the print so it is unique
<span>Because a lot of minerals have the same color</span>
Answer:
The nucleus is a collection of particles called protons, which are positively charged, and neutrons, which are electrically neutral. Protons and neutrons are in turn made up of particles called quarks. The chemical element of an atom is determined by the number of protons, or the atomic number, Z, of the nucleus.
