Answer:
Lithium
Explanation:
<em>"Like the other alkali metals, lithium has a single valence electron that is easily given up to form a cation. Because of this, lithium is a good conductor of heat and electricity as well as a highly reactive element, though it is the least reactive of the alkali metals."</em>
Answer:
Your height, weight, etc.
Explanation:
The physical change is noticeable; one can observe.
Nucleic acid, I’m pretty sure
Sedimentary because it is made of layers of sediment and fossils can easily get mixed in