Answer:
The primary producer would be at the bottom of the food chain.
Explanation:
The formula of the ppt. formed is PbSo4 , which is inslouble.
The answer is (1) CaCO3. The bond between C and O is covalent bond. And the bond between Ca2+ and CO3 2- ion is the ionic bond. So the compound CaCO3 satisfy this condition.
