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.
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1. Plate tectonic - continuing process in which sections (plates) move, instigating volcanoes and earthquakes, mountain construction and trench development.
2. Mid – ocean ridge - common type of divergent boundary.
3. Subduction - one plate sinks under another plate down into Earth's mantle, simple development alongside a convergent boundary.
4. Transform boundary - creating various earthquakes.
5. Rift valley - volcanoes and earthquakes shared and may developed low-lying comprising water.
I just took notes on this yesterday and got 110%
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its option A. bright tail feathers of peacocks during breeding season
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The answer is c
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the the immune system protects the body against harmful pathogens by producing special proteins called antibodies.
