Bones are made up of Calcium Phosphate given by the chemical formula, 
. When bones are kept in Hydrochloric acid, given by the chemical formula, HCl, they become soft because the calcium compound present in the bones changes its form. The following double displacement reaction takes place when the bones are kept in HCl,
---> 
Calcium chloride is water soluble, and gets washed away. This makes the bone thin and soft.
You must use intense Heat and pressure to change a sedimentary rock into a metamorphic
Cell, DNA, chromosome, gene
In order of decreased size
Answer:
The answer would be (B)
Explanation:
Ecological pyraminds were made to give an easy showcase of how earths ecosystem works.
trophoc levels are a part of the food chain, and the 10% rule is the amount of biomass that is carried up the food chain, all of which are involved inside ecological pyramids.
hope this helps!
