Answer:
c. Cr
Explanation:
The compound is containing 
ion.
If acid reacts with it, CO_2 evolves.
therefore, Cr would form a precipitate when added to an aqueous solution of this compound. Cr2CO3 is the precipitate.
Pushing down a piston in an airtight cylinder would tend to increase the pressure in the system since the particle collision and collisions with the walls are now more frequent. Also, pushing further, the gas would undergo a phase change from gas to a liquid.
It makes it thinner to calcite the rhythm
Well, even though some baby mammals<span> are born different ways, they all drink milk that comes from </span>their<span> mothers' bodies. Baby pigs, dolphins, bats and elephants all drink milk! Because the </span>babies<span> rely on </span>their<span> mother's milk to live, the </span>mammal<span>mommies have to </span>care for their young<span>.</span>
If an object is not changing its velocity, then the object is not accelerating. (There’s no acceleration)
