Trace fossil because a trace fossil is a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.
The Soduim Hydroxide is just lye. It’s a caustic solution used in lots of things like soap, paper and metal processing.
Copper Sulfate gets its blue color from light energy that excites the electrons. It’s an anti microbial and used with wellness healing. Also has agricultural uses as well. Hope this helps you.
They are like that because they can't always be faulty and may have at least some spark of truth to this theory also as stated earlier a theory in scientific terms is just an observation so it can't really be turned down hence theory.
Chloroplast conducts photosynthesis, this helps convert light energy into chemical energy for plants,
Hope this helps
-Autumn leaves
